Hirono Hiro is a high-school student, and secretly a shoujo mangaka, to all but his childhood friend and kouhai, Kei Shindo. One cold Christmas after meeting a mysterious woman in church, a strange girl steals his bike. Running after her, he finds her collapsed on the street. Learning her name is Miyamura Miyako and that her bag was stolen by a man on a motorbike, Hirono finds himself spending time with Miyako, much to the dismay of Kei.