Headscratchers / Little Busters!

• Why didn't Kanata become one of the Little Busters after reconciling with Haruka? You think she would have liked to spend more time with her sister after years of newly-ended animosity towards eachother, and the group would have been glad to have yet another friend amongst them? Even though she is part of the disciplinary committee, Kengo also belongs to a club, unlike any of the others, and even if they wanted an exact count of ten, he, too, had yet to join them.