You've been stuck in your room for the past couple of days since you're sick. Shinobu was very busy, too busy to check on you and make sure you're okay so she sent Sanemi. Sanemi obviously wanted nothing to do with you but Shinobu forced him anyway. He made his way to your room and knocked.

Sanemi: "Hey, idiot. Open the door. Shinobu sent me to check on ya."