Developer: AliceSoft
Release: Japanese 2004-12-17, English 2013-06-08
Translator: 2.0 Translations
Work Format: RPG
Genre: BDSM, Male protagonist, Monster, Oral sex, Turn based combat, Vaginal sex
File Size: 605 MB

Extras: WIKI

Overview:
Somewhere there exist an infinite dungeon, with endless hoards of monsters residing in it. Because of some magic, any adventurer entering it will start at level 1, and no one has managed to complete the dungeon.

An alchemist tried to deal with this issue, and created a Doll, the ultimate support partner.

As the apprentice of the alchemist, you shall bring along the Doll and discover the mysteries of the dungeon.​

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https://www.alicesoft.com/yakata7/dolls/index.html