Well, so, this is a detective story with horror and magical elements, around a dumb as fuck teenager who has to get actually killed by the culprit to "resolve" the mystery.
Let's add a useless childhood friend in love with the MC, but just to keep up with the clichés, let's make her never reveal her feelings, actually bully the MC and then get cucked at the end, when she reveals her love way too late.
Oh, and the characters are so cliched and boring... so let's add a way too long scarf to the MC, super strength to the childhood girl friend and a beret and google to a random club member... Oh wait, that makes it worse.
The only redeeming thing about this is the "6 deaths curse" incentive. I might stay for a bit to see if this uninspired mangaka might maybe have one good idea.