Shijou Saikyou Orc-san no Tanoshii Isekai Harem-zukuri
Happy Harem Making with the Mightiest Orc!

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I can see that you’re only interested in the exceptionally rare. Collection of manga with actual harem endings or manga where the harem is official anytime before the very end. Additions welcome. 2 girls, twins, split personalities are also fine.

Possible Additions:
Mato Seihei no Slave
Monster Musume no Iru Nichijou
Nue's Exorcist
Training Regimes of the World's Strongest Women
Kanan-sama
Kimi wa Kawaii Reptile

This is a stack of Unadapted Non-Isekai Fantasy Manga with Overpowered Main Characters.

All of the MCs in this stack are OP from the start.

If you've enjoyed any Manga from this stack, feel free to check out this stack: Unadapted Action Isekai Manga with an OP MC

This is a collection of manga with a true harem, where the protagonist is in a relationship with multiple characters instead of choosing just one of them.

It is updated with newly released series that are not in other stacks.

The story has a protagonist in a Polyamory with romantic development in Fantasy/Isekai. Includes 'Polygamy with romantic development', 'Multiple Lovers/Multiple Partners in an open romantic relationship', or an open romantic relationship with a harem. Also True Harem, Harem Ending, Harem-seeking, Hard-Working, Devoted, Couple Growth, First-time Intercourse, Marriage tag.

(PART 2) https://myanimelist.net/stacks/46938

Adventurer party/Hero's Party in fantasy/isekai
https://myanimelist.net/stacks/36966
Slave Companion in Fantasy/Isekai
https://myanimelist.net/stacks/38526

Story with lewd activities in fantasy/isekai
https://myanimelist.net/stacks/37161
Protagonist's child is born/pregnancy during story (SPOILER WARNING)
https://myanimelist.net/stacks/37305

Polyamory in Modern Setting Romance
https://myanimelist.net/stacks/56274

Human Protagonist's Female Lead, or the Female protagonist herself is a Beastkin in fantasy/isekai. 'Beastkin' includes cat, wolf, rabbit, and others with fluffy ears and tails. This list is only for characters closely resembling a human other than the ears and tails. Also Beastman/Beastmen.

(PART 2) https://myanimelist.net/stacks/57034

Has a Female Lead of a Human-like Race/Creature in fantasy/isekai
https://myanimelist.net/stacks/38185
Protagonist becomes a non-human in fantasy/isekai
https://myanimelist.net/stacks/37527
Romantic Development with Monster Girl Female Leads/Heroines
https://myanimelist.net/stacks/36952

Adventurer party/Hero's Party in fantasy/isekai
https://myanimelist.net/stacks/36966

Has a Female Lead of a Human-like Race/Creature in Modern Setting on Earth
https://myanimelist.net/stacks/47294

Human Protagonist's Female Lead, or the Female protagonist herself looks human while being a part of a non-human race/humanoid creature in fantasy/isekai. This list is for any non-human race other than Beastkin, which includes Reptilian(Dragon, Mermaid), Demon, Vampire, Elf, Spirit, Angel, and others. Characters closely resemble humans other than horns, ears, tails, teeth, wings. Also Monster Girls tag.

(PART 1) https://myanimelist.net/stacks/38185

Additional (currently no MyAnimeList page):
-(Manhwa) Die Melusine (Mermaid)
-(Manhwa) Slave of the Elves / Slave Knight of the Elves (Elf)
-(Manga) Itsunomanika Eiyuu ni naru / I, Who Was Demoted to a Potion Factory, Was Kidnapped by an Elf and Became an Alchemist in a Desert Country (Elf)

Erotic Manga with DOWN BAD plot, what's more to say..? ( ͡° ͜ʖ ͡°)