Ep. 1: Koyomi saves Hitagi and learns about the weight-losing crab god from Meme Oshino
Aired on July 3, 2009

Koyomi Araragi catches Hitagi Senjogahara falling from a height and notices she weighs almost nothing but keeps this secret. He consults class chairman Tsubasa Hanekawa regarding Hitagi’s past illness. Hitagi then confronts Koyomi, threatening him while explaining that a crab stole her weight. After Koyomi promises silence, she staples his mouth but leaves when he demonstrates rapid healing by following her. They visit Meme Oshino, who identifies the culprit as the weight crab, a deity responsible for removing her mass.
Episodes
- Ep. 1 · Koyomi saves Hitagi and learns about the weight-losing crab god from Meme Oshino
- Ep. 2 · Hitagi Senjogahara confronts her traumatic past and regains lost memories with Koyomi's help.
- Ep. 3 · Koyomi encounters Mayoi Hachikuji and Hitagi Senjougahara at a playground, leading to a physical confrontation.
- Ep. 4 · Koyomi and Mayoi struggle to reach her mother's house while Hitagi seeks Oshino's help.
- Ep. 5 · Koyomi learns Mayoi's tragic past while Hitagi reveals her ghostly nature and confesses her feelings.