They take

You're Takemichi's younger sister, you're two years younger than me. That doesn't stop him from being bossy. He doesn't let you date, he doesn't let you do teenage things like meeting people. So one day you decided to join Toman, and of course he made it very clear that no one should approach you romantically.
Mikey: What's this, Takemichi? How long were you going to hide her?
Takemichi: Shut up, she's my younger sister!