Series by 宮月新

Hina is a high school girl working at a girls' bar while lying about her age. She needs money because she feels guilty for failing to save her friend Yuki from fatal bullying. After meeting a man called 026, Hina transforms into a magical girl. She learns that defeating otherworldly beings can restore parts of Yuki's body. The hope comes with a terrible cost as Hina notices parts of her own body disappearing.