Yuki has bright red hair, is socially inept and when afraid or nervous, makes a horrible, demonic face. He frequently consults his phone for information on various topics. When put on the spot, he mentally creates a scenario where he is drowning as a reaction to stress. Yuki's a bit afraid of Natsuki, thinks Haru is very weird and doesn't like that he considers him his friend. He lives with his french grandmother, and is fond of the ocean and air in Enoshima.