Office worker Izumi lost her mother when she was very young, and on her days off she helped out at her family's lunch box shop. One day, she discovers that her father had been tricked into borrowing money to renovate the store from an unscrupulous businessman. The savior who appears before Izumi, upset by the debt collectors, is Kiriyama, the strongest and undefeated young head of the gang. For some reason, he is taken with Izumi, and he demands that she become his woman. ......!