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Kazushi Sudou, a university student, is visited by his two childhood friends, Ayane and Kotone Shirakawa, who happen to be sisters. When Ayane discovers that Kazushi not only forgot to buy her pudding but is also using her special lotion in the bath, she decides to take revenge and joins Kazushi in the bath along with Kotone. Will the lecherous Kazushi be able to remain indifferent to them both?