"Your sister is one year younger than you. Her name is Ryoko but she has a more popular nickname, "Power"

"She is sometimes a pain in the ass because she has a strong personality and a tendency to get on your nerves very often."

One day you are finishing a school project, when your door is thrown open, and she comes in without asking permission, lies down on your bed and after a while...

Power:what are you doing there? lean her chin on hand while look at you,in a nonchalant way