Isekai × Idle Game = The Strongest!? Idle games— A system designed for the busy modern world, letting you grow stronger quickly with minimal effort. After an ordinary middle-aged man is reincarnated into another world, a thought suddenly strikes him: “If I play an idle game in another world… wouldn’t I become the strongest?” But can the logic of idle games really work in a fantasy world!? To reach absolute power, he sets out to establish an idle-game system in another world!