Dammmm looking forward to this one #1 on my list. This circle's games were freaking amazing. I wish this site had a !remindme10days or something.
Do you know what the story is?
The main girl, Kirie, is a demon slayer (taimasenshi, quite literally anti-demon warrior) and a student.
During a school trip, the whole class was spirited away into this strange subspace.
Monsters came to attack, and of course some students/teachers probably going 'we're screwed anyway, better go full evil and fuck to my satisfaction first!'
The 3 primary characters are Kirie, Chika her classmate and Saori, the homeroom teacher and also part of the same anti-demon organization as Kirie.
Some situations listed include the usual suspect like
Brainwashing (hypnosis)
Sexual harassment
Sexual training
And some new ones
Tentacle
Magical girl
'medical exam'
There should be about 40% CG going to Kirie and 60% for the rest.