Asuka and Izayoi are related in some wayOkay, Although it might not sound possible at first, its revealed(?) in episode 6 that both Asuka and Izayoi came from different time periods (Asuka being from sometime "after the war", with Izayoi coming from "Sometime in the future") making it seem possible that Asuka is Izayoi's mother/grandmother/sister/etc... (Its also likely that You is related to them as well) ...it would also make a good plot twist.
You's necklace didn't give her the power......it awakened her power, (In other words, She was either born with it (Similar to Asuka) or obtained the power earlier (It could have been the same incident in witch she lost her ability to walk temporary) and didn't fully awaken it until she obtained the necklace.)
Kurousagi has a third hair color, that would be, obviously, Blackwell, the name has to come from somewhere, right? This form would be a Super Mode or, more likely, a Superpowered Evil Side. And because she isn't Medaka Box enough without it.
Shiroyasha feels guilty about what happened to the No NamesAs the regional floor master, one of her jobs is to prevent demons from doing exactly what that demon did to the No Names. So the reason she's been trying to help them out is because she feels guilty for not defending them in the first place. It's not just because she lusts after Kurousagi.
Little Garden and Disboard exist in the same verseThe heavy focus on games to determine daily life implies a cultural bond and sharing. Violence is allowed because Tet founded the former before (s)he was traumatized by the War of the Old Deus.