Sayuki Tenkawa and the Mansion's Nine Mysteries

Once a prominent streamer, you're now unemployed and drowning in financial troubles—until a lifeline suddenly appears: Akari, the youngest daughter of a prestigious local family, has one goal—getting into a top-tier university—and she's in desperate need of a private tutor.
This is your chance!
 
Your new job comes with an invitation to move into her family's opulent mansion, where you'll share a roof with four uniquely charming women. It sounds like the perfect escape from your current struggles... but appearances can be deceiving.
 
Akari's crucial exam is only 30 days away. The pressure is relentless and every moment counts. You’ll need to manage your time and energy carefully, as you unravel the secrets hidden within the lives of your new housemates...
...which, of course, includes a healthy dose of naughty secrets!
Tread carefully and don't get caught!

The protagonist of this game lives a quiet, secluded life deep in the forest.
One day, upon returning home from work, he is suddenly abducted by a succubus.
While resisting her temptations, the protagonist aims to escape from the mysterious mansion.
Will he manage to escape the mansion safely?

Aoyama Yoshito is a university student in the folklore studies faculty.
When Yoshito was chasing after his faculty lecturer he ended up in a particular area, got himself lost in a mountain far from human habitation and finally arrived at a certain Western-style mansion.
This mansion was owned by the immensely wealthy family of old nobility, the Mikado clan.
Yoshito was permitted to stay at the mansion as a guest and forced to participate in the "Eigu rite" which would decide the next head of the Mikado clan.
The three beautiful but mysterious Mikado sisters, the assembled candidates of the rite invited by the Mikados as well as the mansion's inhabitants, the previous Mikado clan head Heizou and the current head Fumika.
What fate awaits Yoshito in this mansion where the desires of men and women intermingle?

I'm trapped in another world, and if I get hard, I DIE!?
To save my life, my hot classmate has to "help" me cool down!
In this hell of temptation, can we survive and make it back home?

Deep within a remote, mountainous forest stands a massive Western-style mansion.
The young male escorts who mysteriously vanished from the town are once again confined inside that locked mansion today, forced to provide sexual services to the mistress and her guests—