This game has two protagonists... the first is the normal-seeming Koumi Masataka, who begins the story by encountering Sarasa, the game's main heroine, as she eats canned saba miso (mackerel in miso) at a convenience store. The other protagonist is Tsubaki, a young woman who spends her nights obsessing over videos of deaths of all types and thinking about herself in the same situation (it is more complex than that, but if I explain too much, you won't get to experience the creepy weirdness properly).
While this game has four heroines, there is only one actual path. All choices that go off that path lead to cut-off endings ten lines later (which makes sense in the context of full knowledge of the mindfuck), so there really is no point in picking them. For H-freaks, there are multiple h-scenes for each heroine... just don't expect happy romance endings, since there is only a single ending.
There isn't a whole lot I can say about this game besides what I said above without ruining it for you, but I'll tell you what I liked that doesn't touch upon the mindfuck or main story. I really liked the way the Preppers Club members got along, as they are one of those 'group of friends' that can't seem to stay on topic for more than a few seconds at a time (usually due to Yaotome Hanae making a sex joke or one of the others bringing up a subject that derails the conversation). As such, I found many of the scenes involving the club highly amusing.
Tsubaki and Amika's relationship is pretty weird, by any standard. I won't go into details, but don't expect lots of soft normal emotions there.
As a conclusion, I can recommend this to fans of the Harumade series and the mindfuck niche in general. It is often hard to follow what is happening due to the way the story is told, but, even with that, it was an enjoyable ride.