The year is 2030. Mizuho hasn't heard from Kizuki in years. But at the fireworks festival she bumps into...?

Mizuho reminisces the day her and Kizuki started dating. Shin approaches Mizuho with his feelings once more.

Airu takes a chance and confesses his feelings to Kizuki and his delinquent past is revealed.

Mizuho believes her relationship with her friends could fall apart due to her dating Kizuki. However…

The seniors graduate and celebrate their last day at the pool, leaving behind heartfelt messages.

After a fight breaks out with Syugo and Kizuki, the friend group reunites for the first time in years.

Kizuki finally brings to light an incident from the past that caused him to break things off with Mizuho.

Airu reminisces the times he had feelings for Kizuki. Syugo's family restaurant faces uncertainty.

Kizuki quits his job to pursue swimming. Meanwhile, Shin is out with a fever and Mizuho pays him a visit.

Syugo and Mizuho spend their day together in Enoshima. Will Syugo finally confess or end with regret?

Shin successfully performs surgery on Mizuho's dad. Can he finally prove to Mizuho that he can make her happy?

After Shin's proposal, Mizuho makes a decision and goes to the pool to have a heart to heart with Kizuki.