His gf (Kana) hangs out with a guy and a girl + student council soon approached MC to get “revenge”. As soon as they kiss one day it also turned out his gf had s*x with the guy. Then once MC confronts his gf about it, it turns out she just wanted to have s*x (?) and when they broke up, she later on went out with the guy but also had s*x with multiple men.

Now, MC and the girl (Setsuna) are going out together but she soon acts strange including another guy in the council. It also turns out that they were both in a relationship and MC caught them having s*x in the student council room, they were expelled. Throughout this time he was comforted by another sc member named Hana.

2 years elapsed at this point and MC and Hana graduated. But MC was soon approached by Setsuna who became ugly and obese and was at his house’s doorstep for days and was reported to the police.

Once MC and Hana move out they go to a university away from that place. MC once again gets into a relationship but turns out he was getting two timed and the girl was spreading rumours about him I.e the fact he has ED (he doesn’t)

Lastly, Hana confronts him about this and wanted to prove he doesn’t have ED so they have s*x and soon marry happily ever after.

MC girlfriend was cheating from him and had s*x with the classmate. Then confessed that she like to s*x with other people but only comfortable when beside the MC, thus their relation cannot be restored.

The student council president, Setsuna, instigates the MC to date her to make the girlfriend jealous and due she like him too. But she did something s*upid that even worse than MC's ex, she doing affair from MC and got caught by the MC and other student council friend doing s*x in student council room. MC once again broken heart and quit student council. One years after the NTR incident, now the ex student council president approach MC but MC be like "GET THE HELL From Here" and never meet again.

There is another novel that made by the author and somehow related to this novel. Setsuna were featured there and you will see the reason why she cheating from MC.

This author has a bad habit of explaining the actions of secondary characters in the cameos they make in his other novels.

*The girlfriend love him, but since they became a couple, she's so self-conscious about him that she can't talk to him.

*She only sees the other guys as friends.

*The kiss with the other boy it's because he caught her off guard, and since she never talks to her boyfriend in class, he think she's free.

*She only had s*x with the other boy because she saw that her boyfriend was kissing the president (revenge)... But the feeling of cheating was so bad that she felt dirty and told the boy not to speak to her again.

CR. Roberto Rafael

for me Kana is better than Setsuna because she only cheated once unlike Setsuna.