Aikawa Sayuki

A shy junior who belongs to the Occult Study Group. A girl who is one year younger than the main character, who is slot and tends to look down. It's not that it's thoroughly rooted, it's just a shy feeling. However, she is very shy only to the protagonist, and she always lowers his eyebrows and talks extremely less. When she is shy and has something embarrassing, his voice becomes quieter and she is squirring. In the novel version, she acts as a heroine as the author's hobby.