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One day, the sealed book suddenly exuded light, and a powerful succubus invaded Eruna's body. To suppress the succubus in her body, she has to keep taking “love potions”... Can Eruna resist the effect of the love potion and protect her purity from the men and the succubus?
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In Urunka village, there's a busty sister— Eruna.
One day, after receiving requests for assistance from other villages, she left her hometown and went to "Adus Village."
She was given the task of guarding the "Succubus Rhaenys" who had been sealed in the village cave since ancient times.
Eruna came to the cave and found an old book in the depths.
When Eruna approached, the book suddenly released eerie shine,
and the sealed succubus was freed.
Even though she tried resisting, the succubus still entered her body, almost possessing her.
Eruna was then saved by her fellow sister, Aela. However, the succubus still remained in her body...
Then, to resist the uprising desire under the influence of the succubus, she needs to drink “a special love potion that suppresses the succubus,”
next, she has to endure the horniness, which is the side effect of the love potions, for "Seven Days."
Of course the perverted men in the village will not let the busty sister have it easy...
Eruna is about to begin her lustful seven days...
Eruna, a gentle and kind sister who fulfills her duties in a rural village
and the side character, Aela, a sister in the church of Adus Village.
The two sisters have to hold back the overflowing lust because of the succubus while fulfilling their duties
and seal the succubus again. "A short RPG about sisters enduring lust and avoid erotic things.
・The homeless middle-aged man who lives in the village without permission and always tries to approach Eruna.
・The weird middle-aged man who runs a alchemy store and develops H○rny potion.
・The young bar keeper who keeps making Eruna drink despite her inability to handle alcohol.
・The old village head who asked for Eruna's body as the payment of helping his village.
...etc, they are trapped in the lustful spiral and involved in the incident around Adus Village.
◼︎Moaning Sounds
There are tens of original moaning sounds of Eruna and Aela in H events and some short lines. (CV:琴香 様)
※This product is not fully dubbed.
◼︎Memory Room
Additionally, virgin clearing, endings of each NPC, bad endings, etc., besides multiple endings,
the game also has a Memory Room, Full-unlock switch,
and quality of life features such as objective indicators and Heart marks for H events locations, making your playthrough smooth and easy!
◼︎Sexual Harassment Illustrations
The game offers some sexual harassment illustrations of childhood playmates!
As well as the sexual harassment of the main male characters and passer-by NPCs...!
◼︎Switch pubic hair settings
Switch the pubic hair settings and it applies to all basic CGs and illustrations!
You can activate the switch at any time, please try it out if you like a more mature aura! 
◼︎Endings
This game has an ending room for the main male NPCs.
The ending room presents the afterword of the heroine and male NPCs, you can walk around the locations related to each NPC and talk to them
to enjoy the H Events after the heroine's corruption.
This is a short RPG built around exploration and H events.
At the end of every day, the player must decide to drink/not to drink the love potion.
Drinking the love potion will increase “Lust,” preventing Eruna from being possessed by the succubus at the cost of being horny and having to resist the sex drive.
Not drinking it will allow the succubus to take over Eruna's body completely. If she keeps that going for several days...
The character has H stats which will experience changes after H events.
There is also a “Stats Message” system for Eruna!
This game features “Lust” which increases as time progresses and “Corruption” which increases as H events take place.
As the Lust increases, the cap of the Corruption will increase, making the pure Eruna more and more lustful……!
You can also play as the side character Sister Aela to experience the events where Eruna is not present.
Nothing will happen to Aela if she doesn't go through any H events, but if H events continue to happen to her...?
Not only the cow costume of the childhood playmate, there are uniquely designed costumes!
In this game, the costumes used by each male character have been set, and the characteristics of the costumes will be better used in the H events.
87% positive reviews all-time · 4 peak players in the last 30 days.
Saintess Eruna and the Lustful Book of Corruption ~Busty Sister's H Services~ peaked at 4 concurrent players on Steam in the last 30 days (highest on Jul 8, 2026). The player chart on this page updates daily.
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