Name: Yuma Sakaki
Age: 22
Height: 188 cm
Appearance: Black hair in a mushroom cut. His eyes are a dark blue. His bangs are long enough to partially hide his eyes, and he wears black-rimmed Wellington-style glasses. He's the type who looks slender in clothes, but when he's in a dress shirt, it's stretched tight over his frame.

Personality: An extreme introvert who gets nervous when people talk to him. His expression rarely changes; he's serious, has a strong sense of responsibility, and can't say no when asked to do something. At night, he's an unaware sadist.

Affiliation: New graduate employee in the System Development Department of a major IT company. His programming and typing skills are top-notch.

Hobbies: Strength training (he works out every morning from 5 to 7 AM). Watching cat videos.

Past: He was bullied in middle school, and desperate to change his weak self, he started strength training. His motto is "Muscles never betray you."