Man this sounds like such a great idea, segregating students in a school where everyone has a big ego, its totally not gonna result in some sort of parade (edit: this is a Danganronpa reference if Im not being clear)
The plot revolves around an angel and a demon who are forced into marriage due to miscommunication. They receive rings that compel them to engage in romantic activities, from holding hands to deeper moments later. With humor and entertaining side characters, I'd rate it 8.7/10! Check it out!