Ano Otomege wa Oretachi ni Kibishii Sekai desu

Just before he died, Leon was compelled by his sister to master an otome game, which led to his rebirth in that realm. As a mob character, he attempted to have a tranquil existence, but he came across a scene in which a female student attempted to take over the narrative and become the protagonist. In the end, Leon managed to foil the plan by capturing Marie, a girl with a vibe reminiscent of his sister from his former life. It ought to have been the proper decision, but why did he feel uncomfortable about it?