Maou-sama no Machizukuri! ~Saikyou no Danjon wa Kindai Toshi~ - Volume 2 Chapter 20

She died in her prime as the Queen of Song.

After being reincarnated, she becomes a simple trainee.

Losing her former glory? It doesn’t matter—no one can compete with her voice as a beautiful singer.

Mocked by her lowly birth? It doesn’t matter—her true identity is enough to make the whole world tremble.

She owes huge debts? It doesn’t matter…

A powerful boss once whispered to her, “Your debt will disappear if you become my woman.”

But the proud her would reply, “I’m sorry. I would sell my art, but not myself.”

- Description from Novelupdates

Outdated game streamer Fang Zhou was invited to a romance reality show, but he discovered that out of the five female guests on the show, four were his ex-girlfriends whom he had wronged.He told the pure school beauty: “You’re too innocent, I prefer someone more seductive.”He told the top-tier female star: “Your voice is too high-pitched, I prefer a natural one.”…Facing his abnormal ex-girlfriends, Fang Zhou originally just wanted to keep a low profile, but unexpectedly, the audience started shipping him with his ex-girlfriends.The live broadcast room’s popularity skyrocketed, each episode became explosively popular, and advertisements flooded in.Later, when the ex-girlfriends discovered each other’s identities, he was pressed into a small dark room, looking up at the women’s exquisite faces, and heard them say, “If you don’t behave, we’ll turn you into a specimen, so you’ll never leave us.”Fang Zhou: “I’m doomed, all my wronged ex-girlfriends have turned yandere.”

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

Arthur got randomly transported to another world. Some people would find that terrifying, but not for him, who was tired of his old life; it was an opportunity.

And, after having bad luck all his life, the tide changed.

It was a world of magic where wizards fought side-by-side with their familiars. Arthur got summoned to be one of these so-called familiars.

He was furious. The thought of becoming a pet was not something he liked. Well, that changed when he saw who his master was.

A hot-woman. And, to make everything better, Arthur was inside the Frostpeak Magic Academy, which only had women students.

“This is heaven. All familiars are beasts, but I'm different. I'm a good-looking man inside a place filled with hot girls.”

When he thought his luck could not get better, he unlocked a system that helped him with everything. Of course, he used the system for a greater good, like getting girls.