Revival of Steam’s Most Controversial Sex Simulator Where You Reincarnate as a Hamster Among Three Sisters

A live-action romance simulation game titled Sweet Hamster Days is set to return to Steam after its store page was previously removed in late 2025. Developed by Kodansha Game Lab in collaboration with Japanese photo magazine FRIDAY, the game offers a unique premise: players assume the role of a hamster reincarnated into the household of three sisters, experiencing life from the perspective of a pampered pet.

Gameplay and Premise

The game follows the story of Kota, a protagonist who dies in a traffic accident and is reborn as a hamster named Hamta. Instead of ending up in a pet rescue center, Hamta is adopted by the Shiratori sisters—Himari, Futaba, and Miyu—childhood friends of Kota. Players navigate the game through a combination of live-action footage and dialogue choices, all presented from the low-angle perspective of a hamster. The narrative focuses on uncovering the sisters’ personal struggles and hidden emotions while living as their beloved pet.

According to the developers, players will engage in activities typical of a pampered pet, such as napping, receiving treats, and being cuddled. The game also promises “sexy and cute” 4K live-action bonus scenes as rewards for progressing through the story. These scenes are described as unlockable content that provides deeper interactions with the sisters, though the exact nature of these rewards remains unspecified in the primary sources.

Cast and Development

The three sisters are portrayed by Japanese actors: Sayaka Tomaru (Himari), Momoka Takatsuru (Futaba), and Shiori Ikemoto of the idol group Tera Tera (Miyu). The game’s scenario was written by Ken Shimomura, known for his work on the popular mobile game Onmyoji. The developers have noted that the game contains “some nudity” and “sexual content,” which may have contributed to its initial removal from Steam.

Release History and Platforms

Sweet Hamster Days was first announced for a Winter 2025 release on Steam, with English language support. However, the game was pulled from the platform in late 2025 “due to various circumstances,” as stated by the developer in a post on X (formerly Twitter). While the exact reason for the removal was not disclosed, speculation has centered on Steam’s evolving policies regarding adult content. High-profile cases, such as the removal of the indie horror game Horses, have highlighted inconsistencies in how mature content is moderated across storefronts.

The game is now scheduled for a Q3 2026 release, returning to Steam alongside launches on the Epic Games Store and DLsite. The developers have not provided further details on whether any changes were made to the game’s content following its removal from Steam.

Reception and Context

The premise of Sweet Hamster Days has drawn attention for its unusual blend of live-action visual novel and pet simulation gameplay. The game’s description on Steam opens with the line, “I got reincarnated… as a hamster!”—a nod to the popular “isekai” (another world) genre in Japanese media, where protagonists are often transported to fantastical or alternate realities. However, the game’s mature themes set it apart from typical isekai narratives, which are more commonly aimed at younger audiences.

The collaboration between Kodansha Game Lab and FRIDAY, a weekly photo magazine known for its celebrity and gravure (Japanese glamour) photography, suggests a focus on high-quality visuals and adult-oriented storytelling. The game’s live-action format further distinguishes it from traditional anime-style visual novels, offering a more immersive, cinematic experience.

Broader Trends in Adult Gaming

The return of Sweet Hamster Days to Steam reflects broader challenges and opportunities in the adult gaming market. Storefronts like Steam have faced criticism for inconsistent enforcement of content policies, particularly regarding games with sexual or mature themes. While Steam allows adult content, it has occasionally removed or restricted games that push boundaries, leading to debates about censorship and artistic freedom.

Games like Sweet Hamster Days also highlight the growing diversity of interactive experiences, particularly in the Japanese market. Live-action visual novels and romance simulations have gained popularity for their ability to blend storytelling with immersive, often risqué, gameplay. The inclusion of English language support suggests an effort to reach a global audience, despite potential cultural and regulatory hurdles.

What’s Next

As Sweet Hamster Days prepares for its Q3 2026 release, players and industry observers will be watching closely to see how the game is received upon its return to Steam. The developers have not announced any changes to the game’s content or marketing strategy, but the game’s re-listing may signal a shift in how platforms like Steam handle adult-oriented titles. For now, the game remains a curiosity—a blend of absurdity, romance, and simulation that defies easy categorization.

Those interested in the game can follow updates on its Steam page or the developer’s official channels. While the game’s premise may seem niche, its return underscores the ongoing evolution of interactive storytelling and the challenges of navigating content moderation in digital storefronts.