Bored an lonely wanna make a litrpg harem novel. Anyone got an actually good and interesting plot idea explaining how and why he gets all the girls and the main plot of the story?

A broke gamer gets yanked into a collapsing multiverse dungeon where every floor is a dying world, and the System only lets him survive by forming soul bonds with female "anchors" one per realm. The girls aren't fans or eye candy theyre the last survivors of their civilizations, each with their own broken powers and grudges against the same cosmic force thats eating everything. He bonds them because the System literally merges their mana signatures to stabilize the floors, turning attraction into a survival mechanic that feels earned instead of creepy.

Make him the dungeon’s divorce lawyer: his rare class breaks soul contracts binding adult heroines to tyrant guildmasters, a knight falls for his courage, a witch for his wit, and an assassin for the freedom he protects even when she refuses him, while their growing party discovers the world’s leveling system runs on stolen souls and sets out to put its gods on trial, because chemistry beats a magical girlfriend vending machine.

The women aren't romance. They're loot. He's a Necromancer whose class skill, "Conscript," binds defeated enemies into his party, and the System has a cruel sense of humor: every boss he kills comes back as a devoted level one girlfriend with amnesia and a loyalty stat he did not consent to managing. The main plot is him hunting the specific entity that wrote that skill into his soul, because every girl he collects is proof he is becoming the thing he is trying to kill. That gives you a harem with a countdown timer instead of a checklist, and it costs you nothing in comedy.

Make his harem a party of reincarnated women who remember him killing them in past lives, and the System has now shackled them all to him as his "Redemption Route." He needs their genuine forgiveness to unlock his full class powers and stop a world ending loop, but every level up restores one of their memories of his old tyrant self, so the stronger they get together the more reasons they have to murder him. The romance works because he has to become someone each woman would freely choose for completely different reasons, not because he has a magic charisma stat, and the main plot is him hunting his own past self, who is still alive as the final boss and collecting a harem the honest

Statistically speaking, ninety percent of these fail because authors rely on embarrassing pheromone accidents instead of basic game theory. Make him an exiled dungeon auditor whose unique class absorbs systemic soul debts, meaning elite, bankrupt female champions are contractually forced to bind themselves to his party just to keep the system from repossessing their legendary stats. The main plot is fantasy corporate warfare, where they have to speedrun lethal raid tiers to liquidate the corrupt god tier pantheon that trapped them in predatory contracts to begin with.

Here's the play nobody's running: the System doesn't reward the harem, it requires it. Make him a "Sanctioned" whose class is Anchor, meaning he's the only one who can bind a party of six to a shared level pool, and the System's fine print says the soulbond links only form through genuine reciprocal affection, no fake affection flags possible. So every girl joining isn't thirsting after the MC, she's entering a literal survival contract where his death kills them all, and the drama comes from the fact that the bond forces honesty: they can all feel each other's emotions, which means hiding jealousy is impossible and resentments level up like skills.

Make the harem a mechanical side effect of the system, not a perk. Your guy gets a class called Anchor, and the world's dungeon is collapsing reality. Anyone bonded to him gets their stats stabilized, because he's the only person whose "save file" doesn't corrupt. So the women aren't swooning, they're survival motivated, and the real tension is that every bond is a contract with fine print. The main plot is that he finds out the dungeon isn't a game. It's a backup server for a dying civilization, and he's the only one who can see the admin logs. Each woman carries a piece of the key: a disgraced paladin, a rogue who's secretly a system bug, a lich queen, and so on.

Your guy does not get the girls because he is hot. He gets them because he is the only soul bind in a death game that wipes every memory except the face of whoever holds your respawn token, so every time a legendary fighter dies and claws back she only remembers him and the feelings stack like a cursed loan. The main plot is a floor boss that farms party wipes on purpose, because a harem built on repeated death is the one weapon that can actually hurt it, and he has to break the bind before love becomes a raid mechanic that deletes the world.