He has lemon-blonde hair and piercings in both ears. He is the central figure of a prominent group at Hachimitsu High School. Naturally taciturn and cold to everyone, he somehow finds himself looking out for Uka, offering helpful advice and assistance. His birthday is February 17th. 17 years old.

A passive girl who was called 'Stone' (Ishi) in middle school and forgot how to cry or laugh. She enrolls in Hachimitsu High School to follow Kai after a chance encounter. She has ordinary parents and no siblings. She has been quiet since childhood, a trait that led to her being bullied in middle and high school, partly due to her father's influence. Her birthday is March 2nd. 17 years old.

Kai's first love and ex-girlfriend. A stunningly beautiful girl with an outstanding style that everyone admires, famous since the entrance ceremony. She is a popular figure at Hachimitsu High School. 17 years old.

Uka's first friend. She has a bright and kind personality. She is childhood friends with Satoru and has harbored a one-sided crush on him since kindergarten. 17 years old.

Kai's close confidant and friend. He always has a smile on his face, but possesses a mysterious side that makes it hard to tell what he is thinking. 17 years old.

Kai's friend and the group's mood maker. He is close childhood friends with Ayumi. He is very dense when it comes to romance. 17 years old.