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I'm here to make your desire come true. To let you win him back.

However, it's not going to be easy like shooting an arrow, pew! and charming him to instantly love you, poof! and making him rush back to your side tadaa! Nope.

I'll give you the chance to get rid of your obstacles seven times.
In other words, I'll let you choose seven people to erase.

Seven nights. Seven favors. Seven people.
I'll grant your favors, for seven times, to 'erase' anyone from this world.
One per night. One by one, until the 13th.

You can choose just anyone whom you think is the obstacle. Erase someone whom you think that your guy will surely return to you - if - this - or - that - person - just - suddenly - disappears.