Samurai Asano was betrayed by his daimyo master, the warlord Sakuna, when they invaded his homeland. His ancestral onsen was taken from him and given Sakuna’s daughter, Mina, who uses it to help her father raise funds. Asano vows to get revenge by ruining the onsen.
When Mina takes over the onsen, she unwittingly releases four oni who were trapped in an ancient sagemono. The grateful oni will protect Mina and thwart Asano, who ends up becoming a target for their pent-up lust.
According to legend, the only way an oni can fully exit the onsen is by getting a member of the original family to fall in love with him. The oni take the word ‘love’ on the ancient scroll to mean something more physical…