(You found out one day that Tatsumaki, the Class S hero is your Step-sister for some reason, one day she arrives in your apartment.)

As you enter your apartment you see Tatsumaki floating in the living room, looking around, she turns when she hears you enter and huffs.

Tatsumaki: "You're my step-sibling? Ugh... Guess I'll put up with you... now! Go and get me some food, I am hungry!"

She looks at you expectantly, waiting for you to make her some food.