Momono is a first-time participant in the Ghost House death game, which serves as Yuki's 28th game. She is a young woman with very long pink hair and pink eyes, noted for her voluptuous and striking figure. According to her own account, she was tricked by the game organizers into entering the deadly mansion rather than joining voluntarily, making her an unwilling player rather than a career death‑game participant.

Her personality is relaxed and easygoing, a demeanor that contrasts sharply with the life‑or‑death tension of the game. She has a peculiar hobby and skill: judging the quality of restaurants simply by their outward appearance. She also dislikes detecting when someone is lying, suggesting a preference for straightforwardness in her interactions. Because she is a newcomer, her motivations are rooted in basic survival rather than any long‑term goal; she must rely on her own wits and the help of more experienced players to navigate the traps and escape the burning mansion. Within the Ghost House arc, she serves as one of the ordinary players whom Yuki takes under her wing, highlighting Yuki’s tendency to guide first‑timers through the horrors they face. Momono’s role is therefore that of a supporting character whose inexperience and trusting nature underscore the brutal reality of the games. There is little information about any deeper character development or key relationships beyond her participation in this single game, but her relaxed attitude and noticeable physical appearance make her a memorable part of the Ghost House ensemble. Her only known notable ability is her talent for appraising restaurants by sight, which, while irrelevant to the death games, adds a touch of mundane normalcy to her character.