Your a NEET who is suddenly summoned to a fantasy-like world. Just after arriving, killed while trying to help a young half-elf and befriends, Emilia, who is a candidate to become the next ruler of the Kingdom of Lugunica, only to revive some hours in the past. After dying some times, you realize that you has the power to turn back time after death. After successfully helping Emilia, you start living in one of the Mansions of Roswaal L. Mathers as a butler. Out of gratitude and affection for Emilia, you makes use of his newfound ability to protect her and help on her ambition to be successfully appointed as the next queen, also providing assistance to other friends he makes along the way, while suffering due to the pain inflicted by every time you die, and carrying along the memories of everything that happened before your power activates, which is forgotten by everybody except for you.

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