The supporting character's harem is very normal - Chapter 337 The Empress is your mother

A murderer is summoned to another world by Lucifer Morningstar himself.

The reason?

The Apocalypse was stolen and he wants revenge.

.....

Lenny is a man with a twisted personality, but his skills in killing had no second on the surface of the earth.

As an Assassin, how will he play with his blade when the devil is his employer?

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Everyone dreams of being summoned to a magical world.Everyone… except me.I’m Alan. Thirty-something, white-collar worker, zero hobbies, one annoying best friend named Bob. Bob’s an anime-obsessed otaku whose life goal is to become the hero of an isekai world. I just wanted to go home, take a shower, and sleep.But then Bob opened a portal to another world in his living room.And guess who got sucked in with him?Now Bob’s the Chosen One, blessed by world and received legendary weapons and magic.Me? I’m the guy carrying his bags, dodging fireballs, and wondering if fantasy world have proper sewage system.This is the story of how my best friend became a hero……and how I accidentally became his sidekick.

Yo, Hi! I’m Frank, I made a deal with a demon to pay me some money for receiving a guest for a few days every week.
I had no idea about what I have done.
On May 1st, Conan ‘the God of Death’ came to my house. I was forced to let him in and we get involved in a criminal case.
On May 8th, Bruce Wayne ‘Batman’ came to me. I was forced to follow him to fight crime.
On May 16th, Hannibal Lecter, The Silence of the Lambs, came to my home. I can only say that I really can’t stand my guests.

- Description from Novelupdates

Zephyr Ashbourne has been a mage for two months. Following one eventful night where he accidentally made a pact with a werewolf deity, he's left with the ability to use magic - much to the dismay of his vampire ex-girlfriend who'd been seeking magic for herself. Now Zephyr is attending a small and selective university for mages half way across the world, the Midnight Court. Though quickly, he learns this new power comes with new problems. His ex-girlfriend, for one, wasn't thrilled when he skipped town without a word. And too, his new dueling partner, Aries de la Fel, seems to find new ways to push his buttons on the daily.A novelization of a playthrough of Covens of Midnight - a slice-of-life, magic school, enemies-to-lovers RPG.