A story about Shintarou, an average student, and his best friend Akino.

Shintarou and Akino are best friends, who bonded for their love of the artist Sepia Mimosa. The two go to the hot springs togeher, although Shintarou has started to notice feminine traits of Akino the more he gets to know him. He'll have to take a decision which will change their lives.