Mumasekai Lost In The World Of Succubi !exclusive! Jun 2026

Mumasekai wasn’t supposed to be a legend. She was a listless junior archivist at the municipal library—quiet, precise, the kind of person who cataloged grief like it was another set of index cards. Her life fit neatly into margins: morning tea, bus to work, the soft sigh of pages being turned. Then she found the book with no title.

Mumasekai: Lost In The World of Succubi (Japanese: Mumasekai no Mayoi-bito ) is a side-scrolling action RPG developed by Shimofumi-ya and published by OTAKU Plan . Released on September 12, 2025 Mumasekai Lost In The World of Succubi

As an adult-oriented title, it features 29 animated "defeat events" using pixel-art chibi characters. These scenes are triggered when the protagonist is captured by enemies, which include a wide variety of monster girls such as witches, spider women, and cat girls. Players can also use a "Defeat button" or an "Unlock All" lever to access this content directly without playing through the entire game. Mumasekai wasn’t supposed to be a legend

The map layout challenges player mobility while introducing distinct character encounters. Notable zones and interactions include: Lost in the World of Succubi on Steam Then she found the book with no title

The game is published by , a well-known name in the indie gaming space, particularly for fans of Japanese-style role-playing games and visual novels. OTAKU Plan has published dozens of titles, including Home and Dungeon , Hero of the Demon , and Guns of Succubus , solidifying their reputation as a curator of unique, often adult-oriented, Japanese games. Their involvement ensures that Mumasekai reaches a global audience, complete with professional localization and ongoing support through patches and updates.