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Akira, an unpopular college student, has a new sister-in-law, Natsu, when his parents remarry. Natsu has a foul mouth, but in front of her parents, she is a serious and pretty girl. She is not popular with the girls, and she is always trying to get him to be more attractive, saying things like, "I bet you're not popular with the girls, are you? Natsu is outraged by this attitude and attacks Natsu.