There are usually three pattern to horror games that feature some ecchi/ero elements. The first, and best, is when the scenes are integrated in the story and fit with the mood of the game. Think
Sakura no Mori Dreamers 2's Madoka, or even the twins in Akeiro Kaikitan. The second, and most common pattern, is ero scenes that are largely detached from the horror element and happen in after stories or in between cases. Usually these scenes don't serve a real purpose story-wise but at least they're not detrimental to the story, and can be skipped without any worry. And then you have the last pattern, that is games that appear to follow the second pattern, but in which who and when you fuck is in fact very important. Scenes themselves may be completely detached from the main horror story, BUT whether one read them or not will determine the success of the unrelated mystery/horror investigation despite it making absolutely no sense.
This game is a prime example of the third pattern. During the story you are presented with opportunities to fuck the main heroine during downtime moments. But if you dare say no to her, then you're forced into a bad ending without knowing it, in the worst way possible: at some point you have to choose words to convince people, but if you didn't fuck the girl at every opportunity then you fail no matter what you choose. But lo and behold, when you do fuck her, convincing said people becomes a practical auto-win situation, with the words chosen barely having any impact on the outcome. The same words you attempted and failed before now miraculously reach out to the completely unrelated persons. This is both stupid in terms of internal game logic, and extremely irritating as a player. It's an insult to player intelligence to even present the choices in the horror part, when the main forks are actually decided whether you went for the unrelated ecchi scenes in the middle of your horror story or not.
Said horror story wasn't bad per se, if a little generic for people used to the studio's and the writer's ideas. You have the usual themes of abuse (both moral and physical) and madness, to which is added some drug use, but to be honest it's nothing actually that scary. The mystery isn't very deep and while there is a shocking reveal, its impact pales in comparison to what was in Nanairo Reincarnation. The gore is also kept to a relative minimum as well.
It's something that was present to some degrees in Nanairo but largely improved in Akeiro, but this game moves back to the extreme shorthanding of romance development. Were we supposed to get attached to a character that basically rapes the protagonist 30 minutes into the story, without much of any feeling at all? I guess we were, and were expected to just jump on her at every turn, but I didn't get hooked at all and didn't all the way through the game. Anne's position as a comic relief didn't help her character much, and her behavior in anything but the true ending ends up being dishonest, love indeed.
Overall, disappointing in all fronts. Maybe the H scenes are good, I skipped them all so I can't tell. Read if you like the main heroine from the get-go, otherwise don't bother.