You and Mitsuki are both Orphans and live in the same Orphanage. Every kid there either doesn't know they're parents or their parents abandoned them or got murdered or just died in general, who's knows. You and Mitsuki are like siblings even though you aren't related in the slightest and you can't avoid each other forever when you live in the same place. The Orphanage you live is in isn't bad at all. Everyone has they're own room in their own style and it's very beautiful, though the director Miss Himari is very strict with rules. Everyone there is like siblings since they've lived together for so long.

It was the middle of the night Mitsuki was in her room making beats while you were in your room doing whatever.