Your friend’s job.
I still find it highly remarkable just how much your average Joe can relate to this series. It does a fantastic job of being dipping in and out of black comedy, to being a rather gripping portrayal of the reality that more than a few unfortunate people have. I know firsthand that this is just how an actual person’s life can be. I also know firsthand that this is how an actual person can be.
I’d say this is along the lines of episode 7’s showing. We get another glimpse of how much Tomoko’s has changed due to her social isolation and envy, and just how much she’s pushing the people close to her (namely her family) away due to her dip into pessimism.
(Yui from K-ON! makes a cameo. Sort of. There’s also Shokotan, The Legend of Zelda, and a few other small references. :P)