I've seen this game around since like a year ago. And I'm kind of surprised that H-scenes were not planned for the game initially and were only a Kickstarter stretch goal. Cause the character designs and the previews scream "eroge" to me. I thought this must be a VN for dudes who like anime waifus. (I'm a girl) I wasn't gonna download the game until I saw the blood in the trailer. I would say you shouldn't think of this as an H-game cause it isn't intended as one. Even though it kind of looks like it.
Edit: I know I know the description says there is a sinister mystery but it's like a sinister mystery with a harem. It doesn't help that the poor vice principal is cropped out of the main picture (but if they didn't do that it would imply you can date him so I get why they did)