Series by 大暮維人

Koyomi Araragi is a rural-town high school boy touched by vampiric power. A girl named Hitagi Senjogahara suddenly falls toward him and reveals that she has almost no weight. Her condition is tied to a supernatural oddity rather than ordinary illness. Koyomi becomes involved in incidents surrounding these strange beings. The early chapters pair school life with uncanny problems that demand personal intervention.