The supporting character's harem is very normal - Chapter 328 Thank you, Akna.

Chen Rui, an otaku from earth, is reborn into a human body in another world, who falls into the legendary evil, brutal world of the devil called Mozu where humans are treated as food. He has to survive while facing horrors of the devil, violent dragons and a variety of power enemies depending on a strange super system chip and his wits. Surrounded by Devil’s beauties such as black-bellied lolita princess, cold queens, violent dragons, charming poisonous devils …

Zhuge Lan brought the [Emotion Value System] and made a great name for himself in Douluo!Because his soul skills are too strange, he knelt down and cried when he was banned.100% of the time, his sword was caught with bare hands: Kneel down, you little jerk!The Eye of the Sage: Whoever you stare at will get pregnant and give birth in one hour!Hateful Curse: If you hit me, you will have diarrhea, and if you hit me again, you will have dysmenorrhea!......Tang San: Kneel down first when you meet him, and you will have dysmenorrhea if you hit him! Is this person poisonous?!Tang Hao: I punched him to vent my anger on my son, and he had diarrhea so much that he couldn't raise his head for the rest of his life!Zhu Zhuqing: Lan is so handsome, I don't understand why you are afraid?Qian Renxue: You have seen my true female form for a long time, and you are still arm in arm with me?

A side story series featuring the girls of Kyoukai Senjou no Horizon.

He’s the apathetic, sinister school prince, she’s the silly, joyous new student.

When the simple girl meets the sharp-tongued boy——

Gu Zichen: “Su Niannian, are you a pig!!!”

Su Niannian: “….can you communicate properly, and not attack people like this? Even if I am a pig, then I’m a precious and unique pig!”

When the wounded girl wants to escape from the oppressive boy——

“Caring for precious animals is my duty.” Merely one heartless sentence, and he carries her directly home.

But why did he need to care for her all the way to bed, hey!!!

- Description from Novelupdates