俺のタイプ過ぎる美人義妹が「結婚したい」と毎日迫ってきていてとても困っている〜義妹が妹であることを利用して、好き放題誘惑してくるんだが！？〜 (Associated Names)

“We are step-siblings, so we can get married and do all kinds of naughty stuff you know?” The protagonist has had a stepsister, Yumi Ichiiri, one year younger than him, since a year ago. Although he referred to her as his stepsister, he had always treated her as his little sister… or so he thought.…