The supporting character's harem is very normal - Chapter 83 Cooperation

A realm where humans battle monsters and the good die young. 4 weeks ago Will woke up in a new world filled with Monsters and Magic.Thrust into this new reality with nothing more than a class called “soldier” and a leveling system he’s never seen before, Will fights just to survive. When he stumbles across a dying stranger, a mysterious quest line activates. Now Will must head to the front lines where humanity wages war against a ruthless Goblin Horde. There he will join the standing Kadian Army and forge his name from the fires of legend. He’ll have to face Goblins, Hordes of the Undead, cultists, and demons from hell. And that’s just before breakfast. Iron Blooded is a gritty Progression Fantasy with focuses on battles, leveling up, and political intrigue. Perfect for those who like their fantasy with a side of LITRPG.

An anime otaku who has traveled to the world of full-time hunters, in order to live well, he can only keep getting stronger all the time, burying the strong one after another. Your withered life will be continued by me.

- Description from novelbuddy

Kirby Jon transmigrates to a parallel spacetime and is chosen to act as a bank robber in an exercise. Kirby Jon, who has obtained the God-level acting system, would receive a generous reward if he can act as a robber and attain an S-level score.

[Class changing to the hidden class, Demonic Swordsman.] [You are the first one to discover the hidden dungeon.] [You are the first one to discover the hidden…] [You are the first one…] [You are…] I’m a gamer who uses ESP.