This is just so funny, random and cute, and I love everything about it, from senpai appropriating club funds to buy sleeping supplies, to the two random classmates always about to have a fight, to the way the "improved" head model has become a permanent fixture and even a further plot point, and that's before I even get to the new character or the way Usami's jealousy pretty much carries the whole volume without ever becoming obnoxious.