My nephew is my boyfriend! (This is followed by unrelated phrases: "Cheating aunt sandwich," "Tojo Mio," "Morisawa Kana," and "DASS-367.")

Akira, who lives alone, has sexual relations with his two aunts. Both aunts believe Akira is intimate with them and never suspect they will have sex. During the hot summer, Aunt Kana comes to cook, and perhaps due to dissatisfaction, they become close. Then, Aunt Mio also arrives, and both are surprised to see each other. They begin a fierce struggle, using each other's techniques…