So, I finished my first playthrough of the game, on Normal, and as is my usual habit, I went for the sluttiest ending I could manage. In this case, the cum-dump ending.
I have to say that for an H-RPG, it's pretty well put together. It even seems difficult at first... well, at least until you figure out some things about the game, how it works, and what it lets you do. There are several notable things about the game that are worth keeping in mind. Like the fact that you can get TP Regen and HP regen from the HP and TP passive... and you can do this on ALL the characters. It's, quite frankly, a ridiculous thing, because, combined with healing skills and offensive skills and the right combo of stones in slots and whatnot... You can then grind forever.
It's funny how the dev put so much effort into making guns and attachments for them, because due to the passives the characters can have, you're better off without bothering with investing in them. The only exception is perhaps a sniper rifle for the agent dude. There are some enemies that have resistances to dark, poison or both which can be annoying to take down with Ren, but they're usually vulnerable to the good ol' bullet to the noggin, and that second riffle packs a serious punch.
Everything else though? Pretty much useless.
Complete the combo with exorcist girl turned into a heal and buff bot, and everything except boss fights will be over in 1-3 turns. And the only reason the bosses don't suffer the same fate is because the dev made plenty of them into other punch-bags filled with health.
I never used the other two party members for anything.
As for the scenes. Most of them you can get just by passing time and getting Ren to be fucked by everything under the sun. You also have to pass time. Some of those scenes don't seem to trigger until you reach certain points in the game, or until Ren's sex XP is high enough. Using the sex-XP passives is highly recommended if you're going for scene collecting and either of the slut-endings. For everyone else you need to explore a lot and do requests and stuff. The only scene I didn't get in this run, aside from the other endings, obviously, is the Mana 69 one, which I have no idea how to trigger right now.