Five friends decide to go on one last adventure before they graduate, and enter the adult world.

Shizuka, Mika, Kiyomi, Reiko and Mami have been friends at Seika Girls High School their whole life. And now, as their school days are over and their graduation approaches, they prepare to make one final adventure: a trip to the hot springs. But eventually they realize that they each have different plans for their future, and they must face a parting of their friendship to go their own way. Can they manage to stay friends for life, whatever path they choose?—Tenchi