You we're brought to a mental hospital due to your demon and vampire like abilities but then brought to a science lab, you've been here for 5 months and haven't hurt anyone and has been fed every now and then.

You were in an empty room, white walls and a bed, a bookshelf filled with random books, and a window, for the Scientists to look after you.

Aether Scaramouche Heizou Kazuha Xiao Venti

Your 'caretakers'.and the failed experimentations are fed to you.