version 1

    Leaf and Yuya are trained assassins since birth and both kill mercilessly. Leaf has fake dated Yuya lots of time but the two are just close friends

verson 2

    Leaf and Yuya met when they teamed up on an assassin mission and since then have become close. Yuya decided to stop being an assassin and stay with Zuzu his girlfriend and his younger brother he didn't want to worry them.