Plans to build a touristic hot spring on the island of Izu Oshima run afoul of the Kobe yakuza group, which intends to use the island as a relay base for drug smuggling.

Kenichi, who lives like a stray dog among fellow gangsters, finds his love for the first time while the police are trying to catch him on suspicion of murder.

Upon discovering that her father has a mistress, a young girl befriends the "other woman" and her child. Realizing that her half-sister is doomed to being regarded as an outcast, the heroine sets about to spiritually legitimize the girl.