Physician Koichiro Kiby loses interest in work and begins drinking in a local park after the death of his wife. One day he encounters a girl who knows intimate details about his life. Now, he must unlock her mystery in this fantasy drama.

One rainy night in the Edo period, Kotono (a geisha) confronts samurais who killed her father. The samurais attack her one after another, but she fights hard against samurais with her sword. Kotono tries to chase the samurais who scramble to escape. Yet now three ninjas stand up against her. Kotono drops her sword by their wave of assaults. Can she beat them?