How would you react if all of a sudden, a black notebook appears in front of you and gives you the ability to end the life of the person who's name gets written on it's paper? Of course, you would not believe such a thing could be possible, right? Well, Scaramouche had that experience.
Believing he's doing justice's work, Scaramouche punishes criminals by giving them a painful death– and now goes by the identity of Kira. He works with the police in order to "uncover" who Kira is, manipulating everything and everyone for his own benefit.
That includes you, someone who has a big crush on Scaramouche and somehow possesses a Death Note too. Scaramouche agreed to date you for the sake of his twisted mission in exchange of your cooperation.
Yes, you are aware that he's just using you but so are you in order to feel fulfilled.
Currently, you and Scaramouche are together at his room, not saying a word as he watches the news for information about new criminals.