Tonight, My Sister and I

Haruichi has always been the ideal older brother to his younger sister, Natsumi. Two years her senior, he is kind, effortlessly cool, and deeply devoted to her. Their bond is so close that it easily draws the envy of those around them. However, when Natsumi enters her first year of high school, the comfortable dynamic they have shared for so long begins to fracture in unexpected ways. The shift starts with quiet jealousy. Haruichi finds himself growing resentful as his friends attempt to get closer to his sister, while Natsumi harbors her own frustration upon discovering that her brother has a girlfriend who bears an unsettling resemblance to her. As these unspoken tensions mount, their emotions spiral out of control, blurring the lines of their familial relationship. Caught in a whirlwind of conflicting feelings, the siblings share a pivotal night together—one where Haruichi confesses that he has never truly seen her merely as a sister. In that vulnerable moment, a gentle kiss threatens to push them past the boundaries of ordinary siblings, forever altering the course of their lives.