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Ore no Isekai Shimai ga Jichou Shinai!

俺の異世界姉妹が自重しない!

Yuya's last memory is of his sister's final wish: "Live free and be happy." Stricken by the same disease that took her, he dies before he can fulfill that promise. But instead of fading into nothingness, Yuya wakes up in another world, reborn as Lyon, the second son of a noble family.

His new life should be a second chance, but his circumstances are far from free. As the son of a mistress, he is banished from the main house, forbidden from studying, and has a political marriage forced upon him. Determined to honor his sister's words, Lyon begins to navigate this world, searching for the happiness he was denied.

His quest takes an unexpected turn when he starts to suspect that one of the girls around him—a sister, a young fiancée, a slave, or a maid—might be the reincarnation of his own sibling. The story of a boy chasing freedom and his shameless sisters begins.

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