Chappy 1:

Alex Hemmings is Luke Hemmings younger sister. Luke is in a band 5 Seconds of Summer. Alex thinks she might be starting to fall for the guitarist, Michael Clifford. But there are 2 obstacles in the way: 1. Luke is a very over-protective older brother and Michael is one of his closes and best-est friends. 2. Alex already has a boyfriend.

Will Alex Break up with her boyfriend for Michael? Does Michael even like Alex back? How will Luke cope if his best friend is dating his baby sister? Read My Brother's Best friend to find out.