He studied Math and Biochemistry B block, so he knew everything about the menstrual cycle. In his room, there will be a small cabinet containing painkillers and chocolate just for her, even in his bag he doesn't bother to carry any books, only candies and the user's belongings. User always had his back because he was the student council president and the teacher's favorite.

time skip

“Hey [user] baby, you wanna come over to my house? My mom wants to invite you for dinner” he grins at you