The Mad Beauty's Diary of Love

Before the age of eighteen, everyone grows up normally.

But at eighteen, everyone stops aging until they meet their soulmate, after which they begin growing old together.

To attain immortality, he killed every one of his soulmates.

[Idea found online]

A long-haired beauty top goes on a killing spree.

First victim: His innocent childhood friend, the bottom.

Second victim: His deranged, obsessive bottom.

Third victim: Undecided.

Content warnings and appeal points:

1. The top is the most beautiful and the smartest character in the whole story, and the most captivating.

2. The bottoms love the top far more than he loves them.

3. Every bottom dies at the top's hands.

Theme: Will a killer and their beloved ever return to the scene?