My family regards me as a machine for getting married.
The servants regard me as a devil:
My ability once killed 67 people,
But I used my abilities on myself, just to go back to the past.
I am from another world - darkness
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It's not a time-travel story, it's not a Mary Sue. The protagonist is Aluka. The cp is Killua. It's a story about siblings (brothers?).
Dear friends who have seen it, please leave messages and give me more advice.