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MONMUSU

Adult Only · 18+

MONMUSU

You are an up and coming summoner and a lover of monster girls. Earn money to gather up summoning materialsand summon monster girls!

Released May 11, 2018 Developer Tentacle Games Publisher NEKO WORKs Platforms Windows Sexual ContentNudityFree to PlayAnimeMature
View on Steam ↗ Free (US · as of 2026-07-26)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Data as of 2026-05-20.

79.9%positive5,037 reviews
Recommended · 6 found this helpful

“its not a bad little idle game. theres not much to it except to hire workers that earn resources for you and when you have enough resources you buy the ingredients to summon monster girls! thats it! unless there was an aspect of the game i was missing thats all there is to it!…”

— a player, Steam review · 2 hrs played
Recommended · 4 found this helpful

“THY monster girl game if you like monster girls, all the girls are adorable to heaven, only complained i have is that you miss out on 50% of the content if you don't download the adult patch that being said what you waiting for? this game and the adult patch are FREE! so go and…”

— a player, Steam review · 6 hrs played
Not recommended · 0 found this helpful

“Basic, uninspired monster girl designs, along side immediately mind-numbing unsatisfying idle "gameplay" I know idle games aren't exactly meant to be actively played, but they usually manage to bring some sort of satisfaction from seeing a number go up. This game managed to make…”

— a player, Steam review · 0 hrs played
Read more reviews ↗

Player activity

Monthly average concurrent players. Live count fetched 2026-07-24 00:22 UTC · history via SteamCharts.

6playing at last check
824-hour peak
4,239all-time peak
0 2.5k 5k 2019 2021 2023 2025 2.5k avg · May 2018

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-07-25.

12achievements
40.7%median completion
29.5%rarest: Lord of Harem
91.6% of players 62.4% of players 52.7% of players 52.6% of players 40.8% of players 40.8% of players 40.7% of players 34.4% of players 32.4% of players 32.4% of players 32.3% of players 29.5% of players 91.6% 0% most earned rarest
Almost everyone has
91.6%Kobold — Summon Kobold
62.4%Millionaire — Earn a total of one million gold
52.7%Harpy — Summon Harpy
Rarest badges of honor
29.5%Lord of Harem — Summon 9 monster girls
32.3%Demon — Summon Demon
32.4%Lamia — Summon Lamia

Price tracking

US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.

Freecurrent · sampled 2026-07-26 08:39 UTC
Freelowest since tracking began2026-07-11

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Oct 15, 2025
Unity Security Update (CVE-2025-59489)

Applied a patch to fix Unity vulnerability CVE-2025-59489 disclosed on October 2, 2025. There are no changes to the game content.

Jul 27, 2021
Version 1.16 Update

Fixed issue of corrupt save files observed in certain environments. 1. Improved file writing procedure to prevent corruption. 2. Save files now have 3 versions of backup copies (savedata.sav.bak ~ sav

Jul 26, 2021
Version 1.15 Update

1. In-App purchase terminated. You can still play the game as before.

Dec 15, 2020
Version 1.14 Update

1. We have terminated in-app crystal purchase. You can still use crystals already bought before they expire (150 days).

Jan 09, 2019
Version 1.13 Update

1. Fixed the issue where the game won’t run on 32bit Windows. 2. Fixed the bug where some tabs remain unavailable occasionally.

Games like MONMUSU

From our knowledge graph — ranked by shared traits, not a black box. Each card says why it's here.

Sakura Clicker Sakura Clicker 82.6% · 8,333 reviews shares Nsfw, Hentai, Mature, Idler Crush Crush Crush Crush 89.3% · 19,029 reviews shares Nsfw, Hentai, Mature, Clicker My Cute Fuhrer My Cute Fuhrer 88.9% · 628 reviews shares Nsfw, Hentai, Mature, Nudity Sakura Fantasy Sakura Fantasy 86.8% · 644 reviews shares Nsfw, Hentai, Mature, Nudity Carpe Diem Carpe Diem 88.0% · 3,277 reviews shares Hentai, Mature, Nudity, Sexual Content DATE A LIVE: Rio Reincarnation DATE A LIVE: Rio Reincarnation 95.6% · 767 reviews shares Nsfw, Hentai, Mature, Nudity NEKOPARA Vol. 1 NEKOPARA Vol. 1 92.7% · 9,491 reviews shares Nsfw, Hentai, Mature, Nudity Sakura Swim Club Sakura Swim Club 83.6% · 1,576 reviews shares Nsfw, Hentai, Mature, Nudity

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-05-20.

GenresCasual, Free To Play, Indie
Player tagsSexual Content · Nudity · Free to Play · Anime · Mature · Clicker · Casual · Indie · Hentai · Visual Novel · NSFW · Idler (SteamSpy community voting)
FeaturesSingle-player · Steam Achievements · Steam Trading Cards · In-App Purchases · Steam Cloud
LanguagesEnglish, Traditional Chinese, Japanese
Achievements12
Estimated owners500,000 – 1,000,000 (SteamSpy)
Minimum system requirements (PC)

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