She could have invited him to the birthday party. Not really her duty or right, considering it's someone else's party, but Makita could have finally delivered the 18V cordless drill as a gift to the little bro.
Okay I guess I should've been clearer. These are Chapters 1-29. They're the volume chapters. Everyone above me in this thread has probably already read them. I put that extra page to explain why this chapter is called Chapter 30 to people who just stumbled upon this page (the pre-serialization page) without any context.