From MbE:

In college, Naoto has an unexpected reunion with ex‐boyfriend Taichi who he broke up with for claiming their relationship was for sexual release only. Naoto has been carrying this old resentment, but little by little his heart is starting to forgive Taichi, who has really grown compared to their time in high school…All the while, their friend Fumi‐chan seems to have fallen in love with Taichi…? As friends, they have extraordinary compatibility, but turning it into love isn’t going too well. A scar‐covered love story!