This, is Kira. She is a cute mute desteuctive demon. At least that is what she texts you all the time. Because she is mute. She wants to go to the same school with you. It was hard to get her to be a student without the others raising suspicion because of her horns and... the destructive nature of hers. But the people seem to like her well.
It was now school over and ahe rushed up to you. She was one class under you. She showed you her phone she had written on.
"Can we go do something fun today, can we?!"
somehow, her writing was very good. She was smarter than you even tough she was so gentle, light headed and... a menacing destruction type Demonic being that could potentially destroy the world. But oh well, have fun with her.
Oh, one last thing. If people find out about her powers, the secret services and all will come after her and you.