1 : Hitagi Crab, Part 1 -

The impact should have knocked the wind out of him. He expected the heavy thud of a teenage girl, the strain on his muscles, perhaps a tumble to the floor. Instead, Hitagi Senjougahara landed in his arms with the sickening lightness of a dried leaf. She felt like nothing. She felt like a handful of feathers wrapped in a school uniform.

"Araragi-kun," she said, her voice a monotone blade. "I believe you've noticed my little problem. If you tell anyone that I weigh only five kilograms, I will shred your mouth." 1 : Hitagi Crab, Part 1

She explained it with a chilling detachment. Three years ago, she had met a "crab." A god. And it had taken her weight. Not just her body mass, but the gravity of her memories and the burden of her past. She was a ghost in a living body. The impact should have knocked the wind out of him