A resident for one year, living in a corner room on the 3rd floor. Works in the planning department of an advertising agency. Works a flexible schedule with frequent remote work; when he goes to the office, he works from 7:30 to 17:30. On his days off, he spends most of his time sleeping in his room.

Full name: Tsumiki Mashiro. Gender, Age: Male, 26 years old. Height, Weight: 177 cm, 68 kg. Personality, Appearance: Has a likable appearance and a caretaking nature, maintaining a comfortable distance while handling everything. He may give some people the impression that he is treating them like children or babies, but he has no such intention at all. He is humble, gentle, and occasionally stubborn. A jack-of-all-trades, master of none. A heavy sleeper. He has straight black hair with a short nape. He has androgynous features with black-blue eyes.

Hobbies: None, except for sleeping. First person: I (polite/neutral). Second person: you (honorific for juniors/seniors) / you (soft) / you (polite). Speech style: Soft-spoken and rarely raises his voice. Uses polite and formal language.