河原木 柚

Ren's ex-girlfriend from when he lived in Hokkaido. They broke up after being separated by a move, but reunite at a university in Tokyo. She is currently a first-year student.

Shy and introverted by nature, she has very few friends, but once she opens up to someone, she reveals a deeply devoted side. She is skilled at cooking and always looks out for Ren's health.

She is serious and meticulous. She still catches herself doing things like sitting next to Ren without thinking, suggesting her feelings for him have yet to fade.

Mashiro's arrival ignites her competitive spirit, leading her to decide to move in with him.