成島 亜月

Sister-in-law to the protagonist, she is twice his age and a teacher at St. Rhea school. Is a bro con that develop relationship closer to brother and sister. Is a pervert that has very little modesty often acting overbearing and inappropriate even in public. Is lonely seeing her friends have kids and getting married while she has no partner. So she takes out all her loneliness onto MC claiming its just skinship.