Yuu Sakurakouji, an actor with the Ondine theater group, begins the narrative at age sixteen and matures to around twenty-three or twenty-four. Standing 175 cm tall, he possesses a good-looking appearance coupled with a gentle and sweet personality. Professionally, he shares the Ondine theater circle with Ayumi Himekawa.

His deep admiration for Maya Kitajima, sparked by her acting talent, blossoms into enduring romantic feelings. Despite Yuu's persistent attempts to convey his affection and approach Maya romantically, she remains oblivious to his feelings, viewing him only as a friend.

Seeking to overcome his unrequited love, Yuu briefly dates Mai, another Ondine member. Yet, this relationship fails to diminish his attachment to Maya, and his feelings for her persist.

On stage, Yuu occasionally performs as Maya's acting partner. His career progresses significantly, culminating in his selection as one of two final candidates for the prestigious role of Isshin, the lover of the Kurenai Tennyo (Crimson Goddess). Yuu Sakurakouji also appears as a secondary character in the film "Glass no Kamen Desu ga Onna Spy no Koi! Murasaki no Bara wa Kiken na Kaori!?".