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Iinazuke wa Imouto-sama!
許嫁は妹さま！
Shun lives alone with his sister Yuna after their father remarries. Yuna acts harshly toward Shun, often yelling at him for the slightest mistakes.
Suddenly, Haruka arrives unannounced and claims to be Shun and Yuna's new sister. She believes that since she is Shun's new sister, they must love each other, which means they are engaged to be married, and therefore should do ecchi things together. Yuna fights back, announcing she won't give Shun up to anyone. Haruka then concludes that Yuna must also love Shun, leading to a chaotic love triangle.
