When Koyomi Araragi crosses paths with the vampire Kiss-Shot Acerola-Orion Heart-Under-Blade, his mundane life takes a supernatural turn as he becomes a vampire himself. Soon, he finds himself aiding his classmate Hitagi Senjougahara, who has lost her weight to a peculiar crab. Despite Senjougahara's tough exterior, Araragi persuades her to seek help from the enigmatic Meme Oshino, a nomad knowledgeable about the supernatural. As they delve into the abnormalities lurking within, Bakemonogatari explores the hidden monsters within those Araragi encounters, revealing the depths of human complexities.