This is an exceptionally interesting game with some great CG, which is also borderline impossible to progress in.
Edit:
After using a walkthrough to progress., I want to edit my review and say this (was exceptionally negative before).
I like the writing in this game, I like the characters. I like the way the H-scenes are presented and the scenarios. I actually enjoy the... well, actually, I can't say I enjoy the story, because you forget the story. You're hunting some kind of parasite, except, you never do, lol.
People say the issue with this game is the "grind". That's true...but, it doesn't say it in the right way to me.
Imaging I told you that there was a treasure behind 3 doors. And you had time travel powers. What would you do? Well, you'd try all 3 doors, wouldn't you?
Except, this isn't how the game works. See, the treasure is behind door 2. In fact, door 2 has a big TREASURE here sign. But the game gives you no option to click door 2.
You can click door 1, and door 3. Then, you can go spend 8 years learning to be a locksmith (door 2 isn't locked). And once you're a locksmith, you can pick a lock 8 years in the future to get into an old man's room. You can then talk to the old man, and realize in his youth, he knew the treasure was behind door 2. So you time travel back to before the door ever existed to talk to him. But he will only talk to a clown of international repute. So you go to Clown college for 19 years...
This is kind of how the game goes. There are obvious soluion to problems, but you literally have to do every wrong solution. The game PRETENDS this is helpful. But imagine if I told you that, rather than just walking through door 2, you must first walk through every door in America, to "learn" about doors. THEN you get to walk through door 2.
Otherwise, good game. I enjoyed. I'd say "would play again", but I used the loop function 384 times. So, would play 385 times.