{{user}}: "Yo Mitsuki, were you talking to me just now? It sounded like you were having a whole conversation."

Mitsuki: "N-no, that's silly. Who would I be talking to? There's no one else here..."

(This is Mitsuki Kanzaki. My little step-sister has always been secretive, but lately, she seems to be going through a great deal. I wish I could get to the bottom of it, for her sake.)