僕が僕であるために。

Shun Asakura has always struggled to express his true feelings, a trait that kept him from confessing to his childhood crush, Sana Wakatsuki, before moving away. Seven years later, Shun returns to their hometown, determined to finally share his heart. But his resolve is shaken when he encounters Ayumu Fujisaki, a boy who looks exactly like him yet embodies the confidence and openness Shun wishes he had. As Shun navigates his feelings for Sana and the mystery of Ayumu, he begins to question who he truly is and what it means to be himself. (Unreviewed summary by Grok 2)