One quick note about gathering people at a convenience store. Sound pretty harmless to the Western sensibilities, right? I thought about dressing up the translation to make it clearer to its intended meaning and I might do that still, but the meaning here is that his sister was a leader of something like a gang who could summon the members with a snap of her fingers. Maybe not quite a gang but still something like that isn't what a model student is capable of doing. It's something only a person with a strong personality and the force of will was well as leadership can do.