With the Devilish Her…

The publisher declares adult content on Steam. Your mature-content setting is covering the art.

Developer: まろん☆まろん
Publisher: akaeroCore
Released: Aug 19, 2026
Steam reviews: 87% of players recommend it, from 377 reviews — Steam calls that “Very Positive”
Tags: IndieRPGSimulation

On Linux, Steam Deck and Steam Machine

Deck PlayableSteam Machine: PlayableSteamOS Compatible

Valve rates it Playable on Steam Deck. Valve rates it Playable on Steam Machine. Valve marks it SteamOS Compatible.

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Steam

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Cloud saves · The store backs this game's saves up. That cover ends if your account does.From the store listing

Only what the store discloses. Nothing listed here means the store disclosed nothing — not that there is nothing to disclose.

From the game's Steam store page.

Steam lists 5 languages, 1 with full audio.

DEJUS 18 · NudezThe rating board's own rating, as Steam relays it
IGRS BANNED · Penampilan TokohThe rating board's own rating, as Steam relays it
Some Nudity or Sexual Content · Adult Only Sexual Content · Frequent Nudity or Sexual Content · General Mature ContentSteam's content descriptors, as the developer answered them
All characters are over 20 years old. This game contains: BDSM, sex toys, oral sex, breast sex, and pregnant sex. All interactions are consensual acts between adults.The developer's note on the content, from Steam

Steam, Xbox, Epic, GOG, itch.io, Amazon and PlayStation, plus your installed EA, Ubisoft, Battle.net and Riot games. Free.

The developer's description, from the game's Steam store page.

Marina, your friend’s younger sister.

After losing her parents, she has moved between the homes of various relatives.

At your friend’s request, you will take care of her for the next three weeks…

During these three weeks of living together, you will gradually find yourself falling for this charming woman.

Ultra-deep penetration reaching the womb, with everything clearly visible from the bulging lower abdomen to detailed uterine cross-sections.

A progressive adult experience: foreplay → increased body sensitivity → desire reaches its peak ♥︎

Create unique outfits according to your preferences. You can not only sell them but also dress Marina in your creations.

From outerwear, bottoms, underwear, accessories, shoes, to hairstyles—dress up your favorite Marina just the way you like!

Fully enjoy the cohabitation simulation—Endless Mode unlocks after the true ending!

More events, and… the development of additional adult gameplay features!

▲Marina

Orphaned, your friend’s younger sister,

at your friend’s request, she temporarily moves in to live with you.

Her alluring charm makes her someone who makes every man’s heart race at the sight of her.

A wide variety of clothing and accessories, with over a billion possible component combinations
Number of models: 9 | Number of animations: 3,140 | Base CGs: over 70
Endless Mode: Experience a heart-pounding adult cohabitation life after completing the main story