With the Devilish Her… Passes 10,000 Steam Sales in Roughly Three Days

With the Devilish Her… has made a quick start on Steam. Publisher akaeroCore announced on August 23, 2026 that the game from まろん☆まろん had surpassed 10,000 cumulative sales following its Steam launch on August 20.

The game is localized in Japan as 魔性の彼女と... and in Korea as 마성의 그녀와…. Its central setup follows three weeks of living together with Marina, built around everyday interaction, relationship progression, and a prominent dress-up system.

> Adult content notice: Steam classifies the game as Adults Only and lists sexual-content and nudity descriptors. This article covers its release, sales milestone, and gameplay features in non-explicit terms.

Quick Summary

• English title: With the Devilish Her…
• Japanese title: 魔性の彼女と...
• Korean title: 마성의 그녀와…
• Simplified Chinese title: 与魔性的她…
• Traditional Chinese title: 與魔性的她…
• Format: Video game
• Core genre: Cohabitation romance simulation
• Steam genres: Indie / RPG / Simulation
• Developer: まろん☆まろん
• Publisher: akaeroCore
• Platform: Windows PC
• Store: Steam
• Steam App ID: 4321510
• Steam release: August 20, 2026
• Mode: Single-player
• Sales: More than 10,000 copies according to akaeroCore
• 10,000 milestone announced: August 23, 2026
• Time to milestone: Roughly three days after the Steam launch
• Sales figure: Publisher-reported rather than a public Steam sales counter
• Main heroine: Marina
• Relationship: Marina is the younger sister of the protagonist's friend
• Marina's background: She has moved between relatives after losing her parents
• Premise: The protagonist temporarily takes Marina into his home
• Main story period: Three weeks of cohabitation
• Gameplay: Daily interactions and relationship development
• Dress-up: One of the major systems highlighted by the publisher
• Presentation: Interactive 2D character-focused presentation
• Free demo: Available on Steam
• Demo release: June 15, 2026
• Steam Next Fest: Demo promoted during the June 2026 event
• Currently indexed full-game languages: Japanese, Simplified Chinese, Traditional Chinese, Korean
• Japanese: Interface, subtitles, and full audio listed
• Demo: Also supports English
• Indonesian: Not supported
• Content classification: Steam lists Adults Only and mature-content descriptors
• Console / mobile: No new versions for those platforms have been announced
• Current status: Steam version released and available

10,000 Sales Milestone and Gameplay

10,000 Copies in Roughly Three Days

The Steam version launched on August 20, 2026. Three days later, akaeroCore's Korean account announced that cumulative sales had already crossed 10,000 copies.

The publisher thanked players for supporting Marina and said community encouragement and feedback remain a major source of motivation as akaeroCore continues working on future releases.

Steam does not publicly disclose lifetime unit sales for every title, so the 10,000 figure is a milestone reported directly by akaeroCore.

Three Weeks Living With Marina

The story begins when Marina, the younger sister of the protagonist's friend, needs another temporary home after spending an extended period moving between relatives.

At the family's request, the protagonist agrees to take her in for three weeks.

The game then follows their day-to-day life together and the way the relationship with Marina develops through interactions over that period.

Dress-Up and Interaction Are Major Features

akaeroCore previously promoted the Steam release around a “free dress-up × cohabitation life” concept.

Players can change Marina's appearance through different clothing options while interacting with her through a simulation-focused structure rather than simply advancing through static dialogue choices.

That design keeps Marina at the center of the experience, from everyday life at home to the progression of her relationship with the protagonist.

The Demo Arrived Through Steam Next Fest

Before the full release, With the Devilish Her… Demo launched on June 15, 2026.

akaeroCore included it among three demos promoted during Steam Next Fest in June 2026, giving the publisher a broader showcase for its upcoming catalog.

The demo supports English, Japanese, Simplified Chinese, Traditional Chinese, and Korean, allowing international players to sample its basic systems around two months before launch.

akaeroCore Is Expanding Japanese Releases on Steam

akaeroCore describes itself as a brand established in 2025 to publish and distribute Japanese adult games to a broader audience.

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With the Devilish Her… is one of its projects receiving multiple localizations and promotion through both global and regional publisher channels.

The 10,000-copy announcement coming from its Korean account also reflects a marketing approach extending beyond Japan.

Why This Matters

1) The milestone arrived quickly after launch

More than 10,000 copies in roughly three days indicates strong early momentum for the Steam edition according to the publisher's own figures.

2) Steam expands its language reach

The full game currently lists Japanese, Chinese, and Korean localization, while its pre-release demo also included English.

3) The demo built awareness ahead of release

Its Steam Next Fest appearance gave players an opportunity to meet Marina and try the cohabitation systems about two months before the full launch.

Game Information

Additional confirmed information currently includes:

• the Steam version launched on August 20, 2026
• SteamDB records the store release at August 20, 2026 at 04:00 UTC
• akaeroCore announced cumulative sales of more than 10,000 copies on August 23
• the figure comes from the publisher rather than a third-party sales estimate
• regional sales distribution has not been disclosed
• gross or net revenue generated by those copies has not been disclosed
• まろん☆まろん develops the game and akaeroCore publishes it
• the Steam edition is available for 64-bit Windows
• the full game's Steam App ID is 4321510
• Steam lists Single-player as a category
• the official premise centers on three weeks of cohabitation with Marina
• Marina is the younger sister of the protagonist's friend
• the publisher highlights free dress-up and cohabitation systems
• currently indexed full-game languages are Japanese, Simplified Chinese, Traditional Chinese, and Korean
• Japanese is listed with full audio
• Indonesian is not supported
• the demo adds English as a fifth language
• the demo App ID is 4635340
• the demo launched on June 15, 2026
• it was part of akaeroCore's June 2026 Steam Next Fest campaign
• demo metadata lists Custom Volume Controls and Playable without Timed Input
• Steam marks the game and its community hub as Adults Only
• no console or mobile version of this akaeroCore release has been announced
• official availability is listed through With the Devilish Her… on Steam
• the official hub is available through Steam Community
• the 10,000-copy milestone was published by akaeroCore Korea Official X
• global publisher updates are available through akaeroCore Official X
• publisher videos and promotions are available through akaeroCore YouTube
• Steam publisher news is available through the akaeroCore Steam Group

Closing

With the Devilish Her… has passed 10,000 Steam sales only a few days after its August 20 launch, giving akaeroCore and まろん☆まろん an early five-digit milestone for the PC release.

The publisher has not disclosed a regional sales breakdown or revenue figures. For now, akaeroCore says player support and feedback will continue to motivate its efforts on future releases.