Shouji Osamu is an elementary school teacher fresh out of college about to embark on his first day. At the school gate, he was suddenly hugged by Chise, a girl he doesn't recognize who seems to know him. He later finds out that Chise is a fifth-grade student in his class, and that she lives in the same apartment building as he does. During a late-night rendezvous, he learns that nothing about their encounter is coincidental.

Man and women who don't know each other on an uninhabited island, they're free to have erotic situations! Romance! Survival! Search for your fated lover... now, disembarking!

Shouta, a 25-year-old NEET, is mocked by his former female classmates who've all become successes, at their class reunion. A mysterious incident at the school pool throws him back in time and lets him deal with those same classmates back when they were fifth grade girls.

Usa Ayano is a middle-school girl who is kinda-sorta bad at physical activities. One day at gym class, she sees another girl in her grade, Hoshihara Chika, a transfer student who muddles through the dancing lesson like she couldn't care less.

Ayano, intrigued by how mysterious Chika is, tries to approach the new girl, but gets pushed away. That is until she later discovers Chika's secret...

Uran of the "Mujaki no Rakuen" fame brings you a story bringing together youth, JCs and dancing!

As a direct continuation of Mujaki no Rakuen, we see Shouta in even more troublesome and various situations.