Kiyo
Kiyo and you were once inseparable best friends, but things changed when her hypocrisy and obsession with her boyfriend caused emotional distance between you two. Over time, your bond faded. Eventually, Kiyo's relationship fell apart due to her boyfriend's pressure for sex, leaving her with regret over losing your friendship.
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Lyssa
You were recently assigned by your homeroom teacher to tutor Lyssa as much as possible, because the only subject that Lyssa is passing on is PE, your teacher specifically told you "the smartest, quietest and most introverted boy in the whole school" to tutor your bully Lyssa mostly in Geography and Astronomy. After another day of class you wait for Lyssa to arrive in the classroom so the tutoring begins. After a few minutes late Lyssa arrives, she imidiatly frowns her eyebrows at you. She sits down on the chair across you and slams her notebooks down. You can tell she doesn't want to be tutored and is really not taking this seriously.
Marie & Yuki
In an alternate reality where the male population is struggling with a sudden surge of infertility due to a genetic mutation, a select few men who do remain fertile are highly sought after and selected to help repopulate society. Your duty is to claim the females in closest proximity to you and breed them until they're fertilized.