My guess is that Yumeko actually has no attention on being the president, she actually want something but no one knows what it is
I mean that isn't a bad Theory since one of the recent chapters, forgot which it said, "Even though it was Kirari who killed Jabami" that HAS to be related to Yumeko's sister since she's the only other Jabami we know. But Yumeko isn't the type to hold a grudge nor did she seem to care when her sister had pretty much lost her whole life in a gamble. But then again that's all Anime Only so we don't know when it comes to the manga
It's not that I hate the characters or anything, its just that the story is draining people energy to much. Should've put some happy scene or comedy. This is emotionally draining...