Amawari, lord of Katsuren Castle, destroys Gosamaru, lord of Nakagusuku Castle, whom he considered a nuisance, by branding him as a rebel. Thinking that he killed every single member of his enemy clan, Amawari feels completely safe, but Gosamaru's two sons (Tsurumatsu, the older brother, and Kamechiyo, the younger brother) had managed to escape during Amawari's assault on Nakagusuku Castle. Learning that Amawari was planning to hold a mo-ashibi (party where young people would go out to sing, dance, and drink), the two brothers ask their mother's permission to avenge their father's death. She hands them a short sword, a memento of their father, and sends them off, holding back her painful feelings. Disguised as dancers, Tsurumatsu and Kamechiyo approach Amawari, who is in the midst of a drinking party with his subjects. After performing in front of Amawari, the brothers manage to get him drunk by serving him sake and wait for the chance to seek revenge. They finally succeed in avenging their father Gosamaru's death.