Kasumi lives in a remarried household, having lost her biological mother to illness and now residing with her stepfather. Her stepfather, who once ran a factory, was forced into bankruptcy due to economic downturns and is desperately struggling to find money. Meanwhile, her stepbrother, who works under the stepfather, spends his days idling and playing around instead of focusing on work. Seeing the situation, Kasumi pleads with her stepbrother to help their father, but his response is completely unexpected...