A 35-year-old introverted history professor with an inoperable brain tumor. He tutors Rio, falls in love with her, but initially distances himself to avoid burdening her. After Rio urges him to undergo surgery despite memory loss risks, he agrees, confesses his love, and survives the operation, leading to a memory-loss reunion that ultimately turns joyful.
The central romantic bond that catalyzes Rio's personal transformation.
As Rio falls in love with Kouki, she asks him to tutor her, and he eventually confesses his love before surgery.
Explore the full interactive character relationship map of My Rainy Days