高坂 新司

His parents transferred overseas. He is a high school sophomore who moves in with the Onoue family, where the story takes place.

He used to live next door to the Onoue family, but moved out 10 years ago when his father was transferred. He used to be a frail, lazy boy, but he has grown up to be a manly man in proportion to his age.

His personality is a male version of tsundere, honest but innocent at heart. He is often at odds with Saki, who is not so friendly to him after their reunion.

He has had feelings for Saki since they were children, however, they sometimes have a harsh attitude towards each other because of their personalities.