I cannot understand why this show is this happy. The manga does a very good job in showing just how terrible the general cast is, save for Hasegawa (because he's the vanilla protagonist), and does a really good job showing how each character is slowly bonding with one another. Every bit of conflict or animosity in this show is covered over by the peppiest, happiest soundtrack you ever did see.
It feels like whomever's directing this one missed the point. I see myself dropping this one pretty quickly in lye of simply reading the manga.