MONMUSU

Free-to-play idle game about gathering materials to summon monster girls

Tentacle Games · Published by NEKO WORKs · Released May 11, 2018

Reviews: Very Positive; 80% of 5,250
Recent reviews: Very Positive; 83% of 12 in 30 days
Playing now: 7; right now
Steam Deck: Playable
Last update: 11 months ago; Oct 15, 2025

What is MONMUSU?

In this free-to-play idle simulation, you play an aspiring summoner who earns money, buys materials, and summons monster girls.

For you if...

+you enjoy collecting anime monster girl characters
+you prefer games that progress while you are away

Not for you if...

−you want an idle game with lots of active decisions
−you prefer character unlocks without long waits

What players say

80% of 5,250 reviews are positive · 83% of 12 in the last 30 days

Players praise the character artwork and the ability to accumulate currency while the game is closed. They commonly complain that there is little to do and that later summons take too long.

Screenshots and trailer

MONMUSU system requirements

As published by the developer.

Minimum

OS: Microsoft Windows Vista
Processor: 1.8 GHz Pentium 4
Graphics: 1280 x 720
Memory: 2 GB RAM
Storage: 3 GB available space
DirectX: Version 11

PC version details

DRM, required accounts, controller support and Steam features.

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows
Achievements: 12
Steam features: Cloud saves, Family Sharing, Trading cards, In-app purchases