The supporting character's harem is very normal - Chapter 510: Do you want to get out of this place?

She is someone with the nickname “Seatmate Killer”, and also one of the prettiest girl in the school. Every male student that became her seatmate has confessed to her, and all of them got rejected brutally. The one who became her new seatmate, the seat beings located the furthest away from the front and beside one of the windows, thus being a godly seat that will make every male student jealous, is Narito Yuki. He is someone that generally you won’t notice at all. The entire class thought that he will fall for her in a short time, but that may not be the case…..

After seeking pleasure in the nightclub and a night of romance, he discovered there’s a seed in his stomach;

Uchiha Kai has been cautious since he came to this world. He vowed that he must be cautious and go to the end.

But one day he received a mission – to cover the wave wind team to blow up the Kamabashi Bridge, Uchiha Kai knew that he was going to be unlucky…

- Description from novelbuddy

Tyler thought he had everything: good grades, a loving girlfriend, and a picture-perfect life. But everything shatters when an anonymous text warns him that his girlfriend, Alexis, is cheating. Dismissing it as a prank at first, Tyler’s world is turned upside down when he catches her in the arms of Logan Carter—the arrogant, untouchable captain of the football team.Heartbroken and humiliated, Tyler finds himself tangled in an unexpected game of cat and mouse with a mysterious texter. But things take a surprising turn when Tyler discovers that Logan was the mysterious texter all along. Fueled by anger, confusion, and a strange attraction he can’t explain, Tyler demands answers—only to receive an unexpected confession and a kiss that changes everything.