Developed by Japanese eroge circle Takitsubo Channel, the nun-corruption RPG Trials of Interspecies Sisters~Erotic exchange with Humans~ arrives on Steam on August 15. Localized for Chinese players and published in the region by 072 Project, the game leans hard into story-rich, slow-burn lewd RPG territory rather than puzzle-heavy gameplay — a textbook hentai exploration title for fans who want characters and writing to do most of the work.
Release Highlights
The game ships with over 150,000 characters of dialogue, full Japanese voice acting, and Live2D-driven event animation, putting it on the heavier end of indie hentai RPGs in terms of raw content volume. Pacing-wise it stays in classic exploration-RPG territory: you walk the three sisters through human towns, trigger events, and watch their personalities slowly unravel as the journey continues. Combat is intentionally light, the focus is firmly on narrative and event scenes.
Story Background
The setting picks up half a century after the war between humans and the Nonhuman Alliance ended. The peace is technically holding, but trust between the two sides never really recovered, so the Alliance dispatches three nuns into human towns as goodwill envoys. Each one carries her own baggage, and what starts as polite cultural exchange gradually slides into far less holy territory as the locals (and a few monsters) make a project out of corrupting them — exactly as the title promises.
Meet the Cast
The trio is built around three contrasting archetypes: Erika, the upbeat cat-eared bombshell with a heart of gold; Funiru, the sharp-tongued dark-skinned tsundere who can not stop fussing over Erika; and Mariel, their elf mentor and Mother Superior of the church, who has been celibate so long it is practically a personal crisis. The dynamic between them carries a lot of the writing — and yes, all three eventually fall in their own ways, which is exactly the point.
Gameplay & Content
On the content side: 95 H-scenes, more than 500 CGs, and a tag list that runs the full gamut from familiar entries (wall-stuck, milking, hypnosis, bondage) into much heavier territory — interspecies, oviposition, “human toilet” play, and AV-style shoots. It is unapologetically aimed at players who already enjoy corruption, training and fall-from-grace storylines. For players who just want the scenes without grinding, there is a one-click full-recollection mode: you can unlock the recollection room early and jump straight to any event without finishing the campaign.
One thing to note for Steam buyers: the Steam build is censored — certain characters and events are trimmed for store compliance. 072 Project hosts a free R18 patch on their official site that restores everything; just install it after launch to get the full version.
Event Showcase
Below is a mix of animated and public-friendly screenshots so you can get a feel for the production values. Full H-scene CGs are tucked behind an 18+ confirmation block — confirm your age first to unfold the full reel.
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Product Info
| Title | Trials of Interspecies Sisters~Erotic exchange with Humans~ |
|---|---|
| Developer | Takitsubo Channel (瀧壺チャンネル) |
| Publisher | 072 Project |
| Platform | Steam (Chinese localization) / 072 Project |
| Release Date | August 15, 2025 |
| Genre | RPG / Exploration / Adult |
| Key Features | 150,000+ words, 95 H-events, 500+ CGs, Live2D animation, full Japanese VO, one-click full recollection |
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Free R18 Patch: Download Steam-version restoration patch
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