It's the life of a 3rd year high school boy named Koyomi Araragi, who after being bitten by a vampire was able to return to being human, although he has some vampire traits remained in his body. He encounters several people afflicted by supernatural problems caused by "Oddities" - spirits based on the Shinto religion - and tries to help them solve said problems. It's character-driven story and a best one at that with genius music. DO TRY IT AT ONCE!