Ch. 1: A professor is being targeted by his student who is the son of a mob boss and is always following him around school and doesn't do any of the assignments in his class is it to bully him or to protect him after the student saw him crying.
Ch. 2: A tutor is confessed to by his cold and emotionless student his way to get out is to require him to get 100 on all of his exams. When he sees him seriously studying he tries everything to stop him from studying only to realize that he loves him but is it too late.
Ch. 3: A student gets horny on a train and he gets on an earlier train so his childhood friend doesn't find out, but he turns up on that train and helps hide him from the other passengers and take care of his problem.
Ch. 4: A guy that used to be small and cute grew and he is sad that he is cast as Romeo in the play instead of Juliet like in the past and that everyone's attitude changed because of his growth. He decides to put on Juliet's dress when no one is looking,but one of his former guard's that walked him home catches him wearing the dress.
Ch. 5: Kiyoharu, friendless and without a family, owns a single dog, Jirou. The dog, which miraculously turned into a human six months ago, went into heat and ravaged his master. "Jiro, I love you very much - but it troubles me to have you make love to me so deeply." As Kiyoharu becomes deeply troubled, Jirou goes into heat yet again!
Ch. 6 Pg. 1-11: A guy is depressed after a lousy partner and falls asleep drunk to having sex with a human version of his cat that demands he takes better care of him.
Ch. 6 Pg. 12-17: A guy daydreams that his dog turns human and they have sex.
Ch. 7: A guy finds a ruby ring in a window display after his girlfriend told him to get her a ruby ring for their engagement while he is on a business trip, however the shop owner tells him to wear it for a night because the ring chooses the wearer because the wearer of the ring is the soul mate of the emperor.
Koibito wa Hatsujouki