A promise made under a tree three years ago finally gets answered. Four childhood friends return to the place where they buried their hopes, and the OVA doesn't waste time on plot mechanics, it trusts that reunion itself is enough. Flashbacks do the real work, letting you feel the weight of time passing and what each of them became while they were apart. The romance isn't a subplot fighting for screen time. It's the entire reason you're watching two people stand in a school courtyard and realize that growing up didn't have to mean growing away.

Yuzuki, Matsuri, Nono and Makoto grew up as close friends, and three years ago they hid a time capsule beneath a tree at Mochitsuki Academy. They vowed to gather again once exactly three years had passed. Now that day has come, and the four return to their old school, which stands deserted. This two-episode romance OVA with a slice-of-life feel is adapted from a game by Haikuo-Soft.