Roland is an assassin who, one day, breaks from his team and single-handedly “kills” the demon king.
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After returning to the kingdom, the king graciously promises Roland whatever he wants for his heroics. Conflicted in his desires - he hasn’t thought of anything outside of killing for years - he remembers that one of his teammates told him what she plans to do after evil is defeated:
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Live an ordinary life.
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And so Roland, with his ability to become unnoticeable and the disguised demon king/queen Laila at his side, decides to live a - say it with me - slow life.