Skyfire Avenue. Usa Ayano is a middle school girl who is physically terrible at exercise. One day at the gym class she sees another girl in her school, Hoshihara Chika, a transfer student who muddles through the dancing lesson like she couldn't care less. Fascinated by how enigmatic Chika is, Ayano tries to reach out to the new girl but is pushed away. Since his wife's death, Lan Jue, the greatest of mercenaries, codenamed 'Zeus,' has secluded himself here on Skyfire Road. His shop's name is "Zeus' Jewelry Store" and the nickname, Jewel Master, was given here in Skyfire Avenue.