Akira is taken by surprise when his first love's younger brother, Haruto, starts resembling his sibling more and more over the years. Fearing his growing feelings for Haruto, Akira tries to keep his distance. However, a sudden turn of events leads to a night that changes everything between them. Despite Akira's initial reluctance, Haruto pursues him with unwavering cheerfulness, eventually becoming a significant presence in Akira's life. As their bond deepens, Akira grapples with the fear of having traumatized Haruto and the unexpected development of a romantic relationship that neither of them saw coming.