Gotta say first episodes r just kinky and comedy with some romance but after that u will see a lot of plots that gonna make u love the show most of the plot r after episode 7.
Spoilers/plots (the standstill disease Morino has it 2) and it been activated before and its get activated again after she sees Herikawa cry cuz Kei dumped her 4 Mizuho sensei. Later Kei knows and star treating Herikawa as his gf soo Morino stays away from the standstill disease. that just a small fraction of the amazing story u will get