Marshmallow Imouto Succubus

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App ID	2243980
App Type	Game
Developer	Orcsoft
Publisher	Sekai Project
Supported Systems	Windows
Technologies	KiriKiri Engine
Last Changenumber	31542944
Last Record Update	8 October 2025 – 07:21:48 UTC ()
Release Date	22 September 2023 – 18:55:19 UTC ()

❓ 66.33%

18 reviews

In-Game

Tsukikawa Keisuke had a strange dream. That dream involved his younger sister but instead of her usual, innocent self, she had lust in her eyes. So he finds out that a succubus lurks within her! How will he choose between his innocent sister and the allure of a lustful succubus?!

Additional Information

Developer

Orcsoft

ReleaseState

released

Publisher

Sekai Project

Store Release Date

22 September 2023 – 18:55:22 UTC ()

osarch

empty string

community_hub_visible

Yes

Primary Genre

Adventure (25)

Store Genres

Adventure (25), Casual (4)

Steam Release Date

22 September 2023 – 18:55:19 UTC ()

Store Asset Modification Time

22 September 2023 – 05:34:53 UTC () (1695360893)

library_assets

library_capsule	en,zh-cn,ja
library_hero	en
library_logo	en,ja,zh-cn
logo_position ↴
pinned_position	BottomLeft
width_pct	50
height_pct	50

osextended

empty string

name_localized

japanese	ましゅまろ☆いもうと☆さっきゅばす☆
schinese	棉花糖☆妹妹☆魅魔

review_score

review_percentage

Detected Technologies (?)

KiriKiri Engine, Vorbis SDK

Steam Deck Compatibility

Steam Deck:
Valve is still working on adding support for this game on Steam Deck
SteamOS:
Valve is still working on adding support for this game on SteamOS
category: Unsupported
steamos_compatibility: Unsupported
test_timestamp: 12 October 2023 – 00:00:00 UTC
tested_build_id: 12263374

configuration:

supported_input	other
requires_manual_keyboard_invoke	0
requires_non_controller_launcher_nav	0
primary_player_is_controller_slot_0	0
non_deck_display_glyphs	0
small_text	0
requires_internet_for_setup	0
requires_internet_for_singleplayer	0
recommended_runtime	proton-8.0-4
requires_h264	0
requires_voice_files	0
gamescope_frame_limiter_not_supported	0
hdr_support	0

Content Descriptors

Some Nudity or Sexual Content (1), General Mature Content (5)

First seen on SteamDB

6 December 2022 – 02:37:59 UTC (), in changelist #16973868

Content Descriptors (Including DLC)

Some Nudity or Sexual Content (1), General Mature Content (5)

Supported Languages

3 Languages	Interface	Full Audio	Subtitles
English	Yes		Yes
Japanese	Yes	Yes	Yes
Simplified Chinese	Yes		Yes

Assets

Load all asset images

clienticon

22e3d409764c8b5a6e64c3b2a221a898e53643cb

clienttga

39f846a938aa3e62b264349b1e3c96127e177c73

icon

1f76ef444f068a0e6512dd3d307e496f085ebd82

small_capsule

english	capsule_231x87.jpg
japanese	capsule_231x87_japanese.jpg
schinese	capsule_231x87_schinese.jpg

header_image

english	header.jpg
schinese	header_schinese.jpg
japanese	header_japanese.jpg

library_assets_full

library_capsule ↴
image/english	library_600x900.jpg
image/schinese	library_600x900_schinese.jpg
image/japanese	library_600x900_japanese.jpg
image2x/english	library_600x900_2x.jpg
image2x/schinese	library_600x900_schinese_2x.jpg
image2x/japanese	library_600x900_japanese_2x.jpg
library_hero ↴
image/english	library_hero.jpg
image2x/english	library_hero_2x.jpg
library_logo ↴
image/english	logo.png
image/japanese	logo_japanese.png
image/schinese	logo_schinese.png
logo_position/pinned_position	BottomLeft
logo_position/width_pct	50
logo_position/height_pct	50

Assets

main_capsule	capsule_616x353.jpg
small_capsule	capsule_231x87.jpg
header	header.jpg
hero_capsule	hero_capsule.jpg
library_capsule	library_600x900.jpg
library_capsule_2x	library_600x900_2x.jpg
library_hero	library_hero.jpg
library_hero_2x	library_hero_2x.jpg
community_icon	1f76ef444f068a0e6512dd3d307e496f085ebd82.jpg
page_background_path	app/2243980
timestamp	11 October 2024 – 03:14:54 UTC

Trailer 600571 ↴

trailer_name	Teaser Trailer
trailer_category	0
trailer_480p ↴
video/webm	256965636/movie480_vp9.webm
video/mp4	256965636/movie480.mp4
trailer_max ↴
video/webm	256965636/movie_max_vp9.webm
video/mp4	256965636/movie_max.mp4
microtrailer ↴
video/webm	2243980/600571/23ac0b76b052cccae2d83cb5351212a930d954e2/1751527706/microtrailer.webm
video/mp4	2243980/600571/23ac0b76b052cccae2d83cb5351212a930d954e2/1751527706/microtrailer.mp4
adaptive_trailers ↴
dash_av1	2243980/600571/23ac0b76b052cccae2d83cb5351212a930d954e2/1751527706/dash_av1.mpd
dash_h264	2243980/600571/23ac0b76b052cccae2d83cb5351212a930d954e2/1751527706/dash_h264.mpd
hls_h264	2243980/600571/23ac0b76b052cccae2d83cb5351212a930d954e2/1751527706/hls_264_master.m3u8
screenshot_medium	256965636/movie.293x165.jpg
screenshot_full	256965636/movie_full.jpg
all_ages	true
is_highlight	true
timestamp	9 September 2023 – 01:14:52 UTC

Depots

ID	Configuration	Size	DL.
2243981	Windows	233.62 MiB	218.26 MiB
2243985	Windows Japanese	213.36 MiB	205.12 MiB
2243984	Windows Simplified Chinese	237.45 MiB	220.34 MiB

Total size on disk is 684.42 MiB and total download size is 643.72 MiB.

Total size on disk is 233.62 MiB and total download size is 218.26 MiB, when filtered to Windows, English, no DLC depots.

Branches

Name	Description	Build ID	Time Updated
public		12263374	23 September 2023 – 08:38:23 UTC

Other

Name	Value
baselanguages	English, Simplified Chinese, Japanese

Marshmallow Imouto Succubus

Additional Information

Supported Languages

Tags

Categories

Assets

Trailer 600571 ↴

Depots

Branches

Other