Kurisu Fukunaga

Since childhood, he was a child actor, and although they went to different schools, he has been friends with Sōsuke for a long time. For Sōsuke, he is one of the few friends with whom he can openly talk, and sometimes he even stays at his house. He is a kind young man who mediates between Sōsuke and Ririka when they are not getting along, and is considerate of Sōsuke's mother and family relations.

He has also known Ririka since their child actor days and has long harbored feelings for her. She often treats him dismissively, but as a friend, he can also speak up firmly in response.