Seiji's younger brother Michio is sick. He suffers from Xeroderma Pigmentosum (XP) and cannot tolerate the sun or ultraviolet light. He requires round-the-clock care which Seiji cannot provide because of his job. He is a member of the local Yakuza (Japanese Mafia). With their living conditions gradually deteriorating, Keiko, a nurse at Michio's hospital, convinces Seiji to break from the Yakuza and try to live a better life, just him, Michio and her... but can it really be that simple?