Iinazuke wa Imouto-sama!

許嫁は妹さま！

In "Iinazuke wa Imouto-sama!", Shun lives with his sister Yuna after their father remarried. Yuna is frequently harsh with Shun, scolding him even for small mistakes. One day, Haruka suddenly shows up, presenting herself as Shun and Yuna's new sister. Convinced that being siblings means they ought to love each other, Haruka insists that this naturally leads to an engagement and, as a result, that they should participate in ecchi activities together. To shield Shun, Yuna pushes back fiercely and swears she won't let him go to Haruka or anyone else. But Haruka sees Yuna's protective behavior as proof of her love for Shun, concluding that Yuna is likewise engaged to him. Therefore, Haruka thinks all three should take part in ecchi activities as part of their family bonds.

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