Itsuki Mayu

A childhood friend in the same grade who lives next door to the main character's house.

She has a bit of a boyish attitude and tone of voice that seems to make other male classmates shy away from her, on the other hand she is well-liked by younger girls and girls her own age.

Her hobby is making picture books, and she has a girlish side to her. According to MIku, her lack of honesty is what makes her so cute. She does not like to be treated like a girl.