Wait, would this be Do Horrible Things To Soma: The Game?
More or less.
I'll try not to get too graphic in my description, but I'll use a spoiler tag anyway, just to be safe.
[spoiler]The best subtitle I can think of at the moment is "Love Hates You" (a line from a song by Hole). The game would open with Soma's monologue about this tower that appeared out of nowhere, in the middle of a forest. He's worried that whatever's inside the tower is Bad News
(TM) and that he wishes to check it out for himself; he tells Mina not to worry, though if he's not back within a certain time, she's to call the rest of the gang.
(Justification for Soma going in alone: It's safe to assume that any threat to his well-being, Soma would take head-on so that he can fight it on his terms.)
The moment Soma steps inside the tower, the door locks behind him; the few windows can't be opened. Soma does his best to stay calm; he's not sure if this is just another plot to turn him to the dark side.
Turns out, most of the monsters and demons residing in the tower want a piece of Soma--a very specific piece. It's very difficult to avoid them, and they're all rather creative; it would be a step up from "arg snort kill" if Soma actually consented to any of it.
(There's no Game Over screen; any time Soma "dies" (lol pun), he simply wakes up at the last Save Point. Another thing of note is that all of the female monsters/demons are indifferent towards Soma, or at least the prospect of banging him; that's specifically to avoid "how is THAT [twin slasher]? hur hur". Forced-anyone on aynone is not okay, dammit)
Some specific locations Soma enters or passes by on his way to the tower's top are what appears to be a meat locker (this will be important later), a region similar to the first game's
"Harem" "Inner Quarters", and a strange pocket realm where Soma has a run-in with the Elder Gods, who do what just about everything else has been doing to him (this area may or may not be optional).
At the very top resides
Magnus, a vain incubus and the tower's master. He says something to the effect of "I didn't want visitors, but since you made it up here alive, you deserve a reward"--the reward being sex (a bad one, but a reward. At least Soma sorta consents to it this time). Afterward, Magnus tells Soma that he'll find a way to safely get him outside if he brings the incubus a human heart to snack on (shades of "I Have No Mouth And I Must Scream"). Soma remembers the meat locker, and goes back via Warp Points to see if there are any hearts there.
There are, and he brings one back to Magnus. Magnus explains that all the male and genderless monsters/demons are influenced by him, and the tower is designed to keep them all in; Magnus cares little about humans, but doesn't want to run all over creation looking for stray residents. He directs Soma to a tunnel somewhere midway through the tower and tells him that if he can get through that (there are no enemies, but it's very mazelike), he's home free.
Soma eventually does, and walks home.
--
The second half of the game is Mina's. She's furious at Magnus for what his subjects did to Soma (the poor guy's too traumatized to fully relate the story to her, so she didn't get all the details). In the dead of the night, she borrows one of Soma's swords and runs off to the tower.
This time, the monsters are only interested in attacking Mina. (Though, this being an H game, maybe she could occasionally...uh, "spy" on them) The female monsters will gladly tell Mina about the males/the tower/Magnus, if she chooses to listen.
She makes her way to the top using an alternate route (to keep things interesting). When she finds Magnus, she doesn't let him try to explain himself--she just attacks him. Though she doesn't actually kill Magnus, Mina succeeds in roughing him up rather badly. He yells that he wasn't actively trying to make Soma suffer, contrary to Mina's belief, and all Mina accomplished in doing was killing half of the residents.
It's here that it's revealed that the tower is always changing locations, all of which are remote. Magnus assures Mina that he'll make sure that, if the tower relocates to Japan again, he'll make sure that Soma is kept outside; he then tells her to climb out the window and down the side of the tower (using creeping vines and bricks that jut out). Mina would've been given the less dangerous route if she hadn't beaten up Magnus.
When Mina arrives home, she simply tells Soma that he's been avenged.
Some points of interest:
* Any souls that Soma can use function like they do in the canon CV Sorrow games.
* Unlike most other alternate character modes, Mina can level up and open the menu.
* Everything sex-related in this game would be deliberately unsettling and icky. Kinda like Saya no Uta, minus the locales made of David Lynch's bathroom...maybe.[/spoiler]
On a semi-related note, I hope I can find at least one handheld CV game tomorrow (we're going to the one local Gamestop that I haven't checked for CV: Circle of the Moon yet).