Ayanokoj in Re-Zero Universe

They say the road to hell is paved with good intentions. Ayanokoji has no intentions—only objectives. In a world where heroes are summoned to save kingdoms, he was summoned by accident. In a world where emotions fuel power, he feels nothing. In a world that demands a savior, it gets a strategist. And the Royal Selection will never be the same. — Description from novelcodex.org