It happened with a slip.

Koyomi Araragi thought he was done with the supernatural after his recent brush with vampires but that belief is short lived when Senjyogahara, the aloof girl in school, is as light as a feather. The cause? A crab God with a penchant for the vulnerable. But that's just the tip of the iceberg as she's not the only individual suffering from the effects of their brush with the paranormal.

A lost snail who can't find their way home no matter how hard they try and a mysterious deadly arm that can only bring misery despite how hard one wishes. The forever 'Mr. Nice Guy' Koyomi, can't help but embroil himself into their lives to fix their problems with the aid of Meme Oshino, an expert on these matters.