The supporting character's harem is very normal - Chapter 527: The Battle

The Soaring Dragon Continent is a world of summons, you can only become strong if you become a summoner! Yue Yang, an average high school boy, was suddenly transported into this world. When he woke up, he was greeted with a lot of worried faces and found out that he had assumed another person’s identity. Turns out he’s the good-for-nothing third son of the Yue Family, who had just recently drowned himself because of a failed engagement. Unlike the third son of the Yue Family who was useless in summoning, Yue Yang succeeded in making a contract with a summoning grimoire on his first try, even when the other guy failed for the past fifteen years. Others would have a headache making contracts with beasts afterwards, but countless beasts tried to gain favour with Yue Yang instead, acting like a good kid before him.

Yue Yang the brat, however, didn’t feel grateful at all: “Scram, Mythical Beasts! Do you think you are cool like that? Go away from me now, I only like beautiful summons!”

Even when royal families approached him for his talents, the shameless brat replied, “I’m not interested in government stuff, I’m only interested in beauties!”

- Description from novelupdates

Shan Bei inexplicably transmigrated onto a tsundere cat named “Queen”, and was forced to appreciate the daily life of its owner, Mu Qing, and found that Mu Qing was not only coquettish, but also had an extraordinary obsession with her! Σ( ° △ °|||)︴

Fragment one:
Shan Bei’s cat eyes, which were originally staring at the computer, slowly turned to Mu Qing, who was staring at the document. His bi-color eyes were blazing with anger. This guy was yelling at her, and a hidden sex scene was deleted, deleted, deleted, and deleted a hundred times. What on earth was he thinking? ? !
Mu Qing couldn’t help breaking out in a cold sweat being stared at by the “queen”, how come the “queen” has become more and more real recently, she seems to feel that it is staring at her, hell!

Fragment two:
Shan Bei was sitting on the sink, when she saw Mu Qing who took off his clothes and walked into the shower, the cat’s eyes almost fell out, why does this guy like herself? ! Her figure is so good, although she is not as good as Shan Bei. Shan Bei was inexplicably happy, raised his hand to pat his chest, and touched a ball of hair.
Fuck-_-||, I forgot that I am a cat, with a single black line.
When Mu Qing turned back to get the towel, he saw the “Queen” was touching her chest with her head down? ! hell!

Content tags: special liking happy friends city love soul transformation
Search keywords: Protagonist: Shan Bei, Mu Qing ┃ Supporting role: Others ┃ Others: Shuangjie, Funny, Secret

- Description from novelbuddy

“When I left you, it wasn’t because I was materialistic.”

“I know.”

“He doesn’t love me. I already broke up with him.”

“I know.”

“You knew? I didn’t know you were still so concerned about me…”

“I know because he and I are now a couple.”

This is a story about how a poor loser turned into a tall, handsome and rich guy and snatched his ex-girlfriend’s current boyfriend away.

- Description from Novelupdates

Transmigrated into the world of High School DxD, Roy believed he had been handed a life of luxury and glory. Born into the prestigious Lucifuge family, with his Sister Grayfia as his strict yet devoted older sister, he thought he was destined for greatness. 99,997… 99,998… 99,999… 100,000!!But... reality proved harsher: Roy lacked demonic talent and, despite years of training, remained a Low-Class Devil. his peers effortlessly achieve High-Class status, he’s been trapped in a cycle of endless sword practice and ridicule. Yet, he refused to accept mediocrity. Ten thousand sword swings a day, relentless training.. Until one day..[Ding! The Strongest Demon King System has been activated. Access functions to learn more.]---- High School DxD - Main World!1 - High School of the Dead [●] - First2 - Demon Slayer [●] - Second3 - Akame Ga Kill [●] - Third4 - Bladedance of Elementalers [●] - Fourth5 - Campione [●] - Fifth