The supporting character's harem is very normal - Chapter 37 Miam!

Reborn in the Naruto world, Shin Uzumaki finds himself in the doomed Land of Whirlpools. As a member of the Uzumaki Clan! Trapped in a world filled with war, betrayal, and unimaginable power, Shin’s survival seems impossible.. Until it isn’t!![Ding! Replication System Activated!][Daily Login Reward: Common Replication Card.]​​​​​​​[Newbie Gift: Perfect Sage Body—​​​​​​​Adamantine Sealing Chains​​​​​​​—​​​​​​​​​​​​​​Four Symbols Seal​​​​​​​]With the power to Copy any Ability—whether it’s the Kekkei Genkai or Rinnegan or Forbidden jutsu—Shin begins his journey to dominate the Ninja World. [First task: Save Kushina and prevent the destruction of the Uzumaki Clan.]

What if your worst enemies suddenly became your most devoted allies—because you turned them into irresistible, enchanting femboys?Meet Cecil: a cunning, ruthless mastermind hiding an extraordinary power beneath his calm exterior. With a single stroke of his feathered pen, he transforms those who dare to cross him into beautiful, loyal members of his ever-growing harem. But this isn’t some silly game—it's a calculated campaign to build a nation unlike any other.In a world of secrets, magic, and brutal politics, Cecil must navigate a treacherous landscape filled with dangerous foes and hidden agendas. His targets? Only those who insult, threaten, or betray him. His allies? A charming, fiercely loyal band of femboys who live by his side in a shadowy sanctuary.If you think power is all about strength and magic, think again. For Cecil, true power lies in control, seduction, and a pen that changes fate.Welcome to the Velvet Court—where loyalty is beautiful, and revenge is intoxicating.

Summary Version 1:

The mysterious boy Ling Chen is saved by a little girl as he lay on the street dying. Years later, he strikes a deal to save this savior-turned sister and enters the virtual world. In a future Earth where advanced warfare has forced nations to settle issues virtually or else suffer the consequences, Ling Chen bursts into the scene and goes from unknown to legend. Yet all is not as it seems, for Ling Chen has a dark past, and there is a greater mystery at hand behind this virtual world.

Summary Version 2:

To save his terminally ill little sister, Ling Chen enters the newly released virtual game world and joins a small gaming studio comprising entirely of women. From now on walking upon his path towards the pinnacle. An ancient, evil item almost forgotten by history, the “Lunar Scourge” helps forge his unsurpassable legend, and causes him to unknowingly step upon a path that is destined to be punished by the heavens, the way of the shura.

《Live Action Murder Mystery》Case File: