Title : Trials of interspecies Sisters~Erotic exchange with Humans~
Original Title : 異種族シスターの試練～人間とのHな交流～
Language : English (Official)
Developer : 瀧壺チャンネル
Released date : 2025-07-11
https://store.steampowered.com/app/3562310/
https://072project.com/r18/en/shop/RA25047143

After the war, in order to resolve the conflicts between races, nuns from the nonhuman races were sent to human territories for cultural exchange. However, what awaited them there was a road of no return leading to decadence——

Nun exploration RPG.

It's been half a century since the war between human and the Nonhuman Alliance.

The rift between human and nonhuman races remains deep.

Therefore, in order to deepen their relationship with humans, the Nonhuman Alliance decided to send nuns to human towns for cultural exchange.

"Erika" ​​and the other protagonists who were dispatched will gradually lose themselves in happiness during their erotic exchanges with humans.

✦ Characters ✦
▼ Protagonist ▼



Erika (CV 星野天)

An energetic and gentle girl. But she is not very good at using her brain.

Basically, she believes in crossing the bridge when she gets there.

▼Sub heroine ▼



Marielle (CV 麦咲輪紫葵)

She is the head nun who leads the nuns in the church, and is also the teacher of Erika and Funiru.

Although she likes her husband very much, she has not had sex for decades after marriage, so she is quite sexually frustrated.

She is very concerned about her inverted nipples.



Funiru (CV 琴香)

Erika's childhood friend. Although she is afraid of trouble, she becomes very impulsive when Erika is involved.

Slightly hates humans.

✦ Various H events for the protagonist! ✦


▲Their breast milk cannot stop, so let the humans milk them!

Came using their nipples because it felt too good!




▲Offer pussy to a stranger because of hypnosis.

Pussy getting toyed to squirting!




▲Unconscious pussy play via sensory deprivation holes!

Orgasm from the accumulated pleasure!




▲Roped up BDSM as the pussy getting trained!

Crying and begging for orgasm!


✦ Multiple H scenes from the sub-heroines! ✦


▲Laying eggs!

Pussy laying eggs while having an orgasm!



▲Erotic Massage Development


✦ Information ✦
・Estimate play time: 3 to 4 hours.

・Multiple endings.

・Recall mode/H event full unlock button.

・Sound effects.

・Dub (CV 星野天) (CV 夢咲みるく) (CV 麦咲輪紫葵) (CV 琴香)

・Live2D animation is fully dubbed.