When Kenichi watches TV, Ninja Hattori enters and surprises Kenichi. Hattori does all the household work and surprises Kenichi and his family.

Koike-Sensei gets afraid of Hattori's shadow and runs to school. He scolds Kenichi at school, but Hattori saves Kenichi.

Kenichi wants a model locomotive. He tries to save money by helping out at home, but Hattori finishes his errands before Kenichi. Hattori-kun is kicked out by Kenichi who gets angry, but he starts a part-time job at a soba restaurant for Kenichi.

Shishimaru (Ninja dog) helps Kenichi and Yumeko from a dog and disappears. So, Hattori catches Shishimaru and brings him home.

Hattori makes Kenichi study hard and does not allow him to rest. As Kenichi scores good marks, Ama gifts them both.

Kenichi takes Hattori's help and does all the household work. Kenichi surprises his parents on their wedding anniversary with a celebration.

Hattori trains Kenichi to play baseball. But as Kenichi fears to play the match, Hattori plays on his behalf. Later, Kennichi plays and wins the match.

Amara meets Hattori and fights with him. So, Hattori decides to teach Amara a lesson, but Koike-Sensei scolds Kenichi.

Shinzou finds Hattori and helps him get rid of Amara. Hattori introduces Shinzou to Kenichi's family.

Koike-Sensei visits Kenichi's house. Shishimaru loses his grip and falls on Koike-Sensei and gets him unconscious.

Shinzou loses his way and the list. So, Shishimaru and Hattori guide him. Shinzou tells everyone about his deed.

Yamamoto visits Kentaru as a schoolmate. In the night, Yamamoto robs and tries to leave but gets caught. A cop declares a reward to the family.

Kenichi takes Hattori and Shinzou's help and wins the race on sports day.

Hattori and Kenichi click pictures of Kemumaki's cat while he robs the fruits and proves Kenichi innocent to the neighbour.

Kenichi gets a bad dream of Kemumaki threatening him and gets afraid to go to school. On seeing the doctor, Kenichi reveals the truth and makes Kemumaki his friend.

Kenichi impresses with his picture of a UFO. After returning home, Hattori tells Kenichi the truth about the UFO.

Kenichi insists Hattori on teaching him the Ninja technique and misuses it. Kenichi promises Hattori to use the technique at the right time.

Kenichi enjoys his day and forgets to complete his homework. Next morning, he is surprised to see his homework completed by Hattori.

Kenichi assumes Shinzou has been kidnapped. After a lot of struggle, Hattori and Kenichi are shocked to find Shinzou with Koike-Sensei.

Kenichi takes training from Shishimaru and acts just as Shishimaru teaches him. The audience has a hearty laugh watching the talent show.

Kenichi and his friends visit the cocoa garden. While plucking the fruits, they get caught by the manager, but he allows them to take fruits.

On hearing Shinzou's cry, Hattori shows the family a room that he uses to meditate at night.

The Mitsuba family visit the zoo. Shishimaru shows his ninja techniques to the lions as he wishes to be like them.

Kaiko Sir announces students to sketch in autumn. Hattori takes a goat's look and eats Kemumaki and Kenichi's drawing paper and saves them from feeling ashamed before the teacher.

The school takes the students for a picnic. Kemumaki provokes Hattori to fight but Hattori stays calm on Kenichi's insistence.

Kenichi and Kemumaki shows Yumeko movie ticket. They fight for going with them. Then Yumeko goes with Shinzou.

Kenichi sees Yumeko posting card in Letter Box with praying for doll. So Kenichi helps Yumeko for Doll. Kenichi wins a doll prize. He gives to Yumeko.

Kenichi finds fishing rod in cupboard but it broke. So, Hattori makes New fishing Rod. Kio gives garbages to Hattori's fishing rod with avoiding fishes. Shinzo brings big fish from market.

Kemumaki finds eraser in ground so he shows to Kaiko Sir so he gives Kenichi incharge to find lost properties. So Shishimaru smells and find every lost property.

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Kemumaki troubles Kenichi and calls Hattori Kenichi's bodyguard. On seeing Kemumaki treat a dog with care, Kenichi, Hattori, and Shinzou are shocked.

Misuba checks flower not grown. Then Kenichi's father brings box of sweet potatoes. Then Kenichi and Shinzou gets trouble of potato. Then they dig ground and hides potatoes then Hattori grows flower full of potato.

Kenichi forgets his book at home. So, Hattori and Shinzou go to Kenichi's school. But Shinzou's cry makes everyone faint.

When Papa sits in train so Misuba tells that He has become fat. So He starts dieting by not eating food. He sees everything as Food.

Kenichi and his friends reach Tokyo without informing their parents. After returning, Kenichi's parents have a discussion about the trip.

Shishimaru and Kenichi find a gold coin, but Shinzou loses it. Later, Hattori returns the gold coin to Kenichi's parents.

Hattori hypnotises Kentaru to find the person who has robbed Kentaru's salary. He catches the thief and returns Kentaru's money.

Kenichi uses magic tricks on his teacher. Later, Kemumaki uses magical tricks on Kenichi and makes him his pet.

Kenichi plays dodgeball with their friends. Hattori teaches Him to play dodgeball. So Hattori makes him dodge ball. To teach him lesson. Then He turns into lion.

Kenichi's Neighbour gives a Yuki baby which trouble. This Baby troubles Kenichi and Hattori. Then Kenichi's Neighbour then takes Yuki back.

Kenichi pleads to Ama to let him watch a movie, but she refuses. Kenichi helps Hattori in the household chores and is rewarded by his mother.

In the race between the Kiyo and Shishimaru, Hattori saves Shishimaru from all the obstacles and helps him win it.

Kemumaki tries to stop Kenichi from going to Yumeko's place by harming Kenichi, but Hattori manages to keep him safe.

When Misuba Family sleeps at night. But then they heard noise of earthquake. So they practices to save things in earthquake.

Kenichi makes a story on catching thieves. Kemumaki tries to spoil. Yumeko tells Kenichi to makes story on walking on water. Then He takes help of Hattori.

Kemumaki tries to show Yumeko and Kenichi about balancing in bamboo stick. But Kemumaki challenges Kenichi to skate till the town.

As Shishimaru swallows a diamond, the kids use a vacuum cleaner to remove it. They later find out that the diamond is artificial.

Kenichi eats biscuits in night then Misuba tells Kenichi to brush in night. But Kenichi gets tooth ache in School. So he takes help of Hattori.

Kenichi's Father sings song loudly so everyone family gets disturbed so Hattori makes rice ball of voice without disturb. Then Hattori collects in Scroll.

After Kenichi's parents leave, a thief enters as a guest. But Hattori and the kids teach him a lesson and get him arrested by the police.

Shinzou goes out with Shishimaru to get a gift for Kentaru on his promotion. Later, they return home with a gift and get a gift from Kentaru.

Kenichi plays hide and seek with Yumeko and Kemumaki, but Kemumaki troubles Kenichi. The next day, Kenichi tricks Kemumaki.

Shinzou changes the look of Shishimaru and gives him to Kenichi to gift Yumeko. Later, Shinzo admits that he transformed Shishimaru.

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Kentaru gets a frog made of gold. Kemumaki threatens Hattori and makes him his slave as he fears frogs.

Kenichi gets 20 marks in exam in his paper. Then Kenichi tries to burn paper but paper flies. Then Kenichi paper goes into cycle. Then Kenichi tries to take paper from cycle. Then Kemumaki takes paper and mix paper. Then Hattori takes real paper.

Shinzou feels bad for always losing the finger game. Hattori, Kenichi and Shishimaru go in search of Shinzo and feel happy on finding him at the end.

Kenichi makes a plane with Hattori's help and impresses Yumeko by flying the plane himself.

Kemumaki uses the ninja technique of rabbit ears against Hattori. Hence, Hattori uses the same technique and fools Kemumaki.

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Kenichi shows him his clicked photos then he shows his dirty photo of his dads photo. Then he tries to click duck photos.

Kenichi opens a parcel and shares the cake with Shinzou and Shishimaru, but later realises it was the neighbour's parcel.

When Kenichi and Shinzo was playing tennis then Shinzo saw a baby of tiger and Kenichi tries to take care.

Kenichi and Yumeko goes to Haunted House. Then Kenichi and Shinzo goes inside house. Kemumaki disguise as ghost. When Hattori gets to know the truth he teaches him lesson.

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Kentaru finds it difficult to go to work due to a hangover. Kenichi gets angry as his father never spends time with him and seeks help from Hattori to stop Kentaru from drinking.

Misuba makes cheese cake but mice eats all cheese cake. When Misuba scolds at children's. When All heard Dad's screams then all comes. Then Hattori tries to trap mice by making them eating cheese balls.

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Kemumaki plays a prank on Kenichi by making him win a lottery. Later, they find out that they have won a lottery in reality.

Kaiko announces to go at skiing. Then Kenichi takes help of Hattori. Then Kenichi practices for skiing. Kenichi teaches Yumeko how to skiing. Then Kenichi and Kemumaki falls down.

Misuba Family cleans house. So Shinzo asks Misuba clean house but they tells Shinzo to play. But Shinzo reads comics then he sleeps. Then all find Shinzo in Garbage area.

Kenichi goes to library for reading book. But Uncle stops Kenichi to stop reading in free. Shinzo comes to read comics and cry. Hattori hypnotizes.

Kenichi and Hattori go to a salon to get a haircut. On seeing Kemumaki coming, Kenichi becomes a hair stylist and shaves Kemumaki bald.

Shinzou and Shishimaru help Kenichi to become tall by attaching artificial legs. But later realizes the outcome and refuses to grow tall.

While Hattori practices a ninja technique of hearts eye, Kemumaki attacks him. Then, Hattori uses honey to attack Kemumaki.

On Christmas Eve, Hattori puts gifts in Shinzou and Shishimaru's socks. They both feel very happy and also get to know that Hattori is Santa Claus.

Misuba family goes out. Shishimaru captures thief. In newspaper Shishimaru comes. So Kio also does same like Shishimaru.

Shinzou requests Hattori for ninja technique. But Kenichi and Yumeko goes for cycle riding. Kemumaki and Kio convince to use ninja technique upon Kenichi. Yumeko and Kenichi is in trouble. Hattori saves and teaches lesson to Shinzo.

Misuba invites Everyone to tea party. But Kemumaki breaks the cup of tea. Kemumaki sticks bowl with Glue. Kemumaki and Kenichi fights then he breaks. Misuba scolds for breaking. Hattori teaches lesson by making truth of breaking of bowl.

While preparing rice cakes, Ama loses her ring. Later, Hattori finds the ring stuck in Shishimaru's tooth.

Kenichi writes a letter to Yumeko, but Kemumaki adds a few lines and posts the letter to Yumeko. Hattori helps Kenichi find the letter with his ninja technique.

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Hattori and Kentaru play the bamboo stick game and ask Kenichi to join them, but he gets engrossed in the video game. Later, Kenichi learns the game and Ama gets addicted to the video game.

Hattori felt something strange about Shishimaru. She seems to have fallen in love with a dog named Mary, but Shishimaru's efforts are in vain. In order to cheer up the heartbroken Shishimaru, Hattori decides to go out of his way.

Kemumaki invites Yumeko to Surprise House, an attraction full of surprises in the dark. When Kenichi sees it, he says he's going too, even though he's not good at darkness. There, Hattori teaches him the ninja technique of "Cat Glasses", but it's actually a lie to give Kenichi confidence.

Kenichi decides to stay awake and not sleep, so as to reach school on time but fails at it.

As Kentaru and Ama argue on silly topics, Kenichi, Hattori, Shinzo and Shishimaru try all possible ways and bring them together.

Kenichi and his friends are asked by the owner of a cake shop to take care of the shop. Kenichi and his friends panicked when Shishimaru accidentally ate a half-made decorated cake during the store, so they decided to disguise Shishimaru as a cake instead to survive the situation. Meanwhile, the husband who came back finished the Shishimaru cake without knowing anything and went to deliver it.

A ninja girl named Sonam comes to Kenichi's house. Sonam pampers Hattori and does all the housework.

Kenichi plans to trouble Sonam so that she leaves his house. After knowing about Kenichi's plans, she goes away.

Gluttonous Shishimaru eats most of the food in the house with the ninja technique of "gluttony". As expected, Shishimaru has an upset stomach, and Hattori makes him promise to fast for three days. However, Hattori, who is worried about whether Shishimaru will be able to keep his promise, creates a device to monitor Shishimaru.

Kenichi is overjoyed when he receives an 8mm camera for his birthday. He immediately decides to use the camera to make a ninja movie starring him. However, Kenichi, who can't imitate the movements of a ninja, changes the main character to Hattori and continues filming, but Hattori is too conscious of the camera and can't behave well.

Kenichi decides to start delivering newspapers for his father. Hattori and the others are impressed by Kenichi's filial piety and willingly cooperate. Kemumaki who doesn't find it amusing, plans to get in the way with Kiyo, while Kenichi is getting more and more enthusiastic with Yumeko's support.

Kenichi and his family decide to go out for a picnic without carrying lunch. On the way, they eat the rice cakes that Hattori prepares.

Kenichi finds money fallen on the road. He later confesses the truth to his mother and she gives him money to return to the person.

Koike-Sensei gives the students an assignment of writing stories. Kenichi tells a story of a brave soldier.

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Kenichi who is tired of playing as a child, asks Hattori to become an adult for just one day. With the help of Hattori, Kenichi borrows his father's clothes and disguises himself, sneaks out of the house, goes out into town, and takes a peek at the adult playground.

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