The setting is a seemingly happy and peaceful tiny-ass rural village in the 80s. The characters are some kids, both native and from other sities. Suddenly, weird ass terror psychotic shit starts popping up everywhere. Not exactly something you’ll want to watch at night, so to speak.
That’s pretty much the best way to describe it without spoiling. It’s based on a visual novel (That, for once, is not an H game) and I’ve been told that Studio Deen handled the transition into anime somewhat poorly, as you need to pay a LOT of atention and some stuff is presented in confusing ways (For example in Tsumihoroboshi, Rena in makes it sound as if Keiichi was a serial killer, when in fact’s it’s much sillier than that). It’s still fairly entertaning, though a lot of people seem to get bored by it once the OMGWTF starts to wear off.
Watch at least the first four chapters.