Mizuha's 17th birthday is ruined by a pandemic canceling events. Her childhood friend Mizuki unexpectedly declares his intent to date her, sparking a youth story about their friend group.

In a flooded world, a boy rescues a robotic girl from the sea. Grateful, she vows to be his "leg" until fulfilling her former master's order, leading to an unforgettable summer adventure.

A group of girls hop onto an abandoned train to explore the outside world with strange anomalies.

Yoshida gets rejected by his crush at a dinner party, and while heading home he meets a homeless teenage girl.