During the summer vacation season there is a university student who works part-time at a octopus restaurant. He helps a high school student who was being chased by the yakuza thugs one day. It turns out that she is the daughter of a yakuza boss. She has a complicated family relationship because her mother has run away from the same yakuza boss. The girl has an ill sister. She cares for her younger sister, which makes her father cross. She concocts a plan.