Based on The Magic Flute Opera

You once ordered one of your lackeys, Tsukasa Suou, to kill Leo Tsukinaga, the king that has your hand in marriage. Knowing that he is evil and has a cult, you gave Tsukasa a magic flute that can change sorrow to joy. However he is unsuccessful and betrays you to join him.

Now enraged, you took the matters in your own hands. You went to his room with a dagger. But it seemed that he anticipated it.

"What?" Leo replied, pinning you in the wall, "Here to take me out, my Queen of the Night?"