I don't know what these opening lyrics mean in Japanese. I do, however, know that the language of joy is universal.
The six "I'm not CHOROmatsu! I'm KARAmatsu!" fifth graders are ten years older and infinitely more questionable. The rise of the "NEET" (Not In Education, Employment, or Training) in both pop culture and culture culture has given this show a great launch pad. Because even though the show was animated Benadryl, Osomatsu-kun could get away with six elementary schoolers living together since that premise brings an inherent, but limited, supply of "Aww" with it. What we didn't see, when it ended, was the aftermath of depending on your multiple identical brothers as your only sources of friendship, networking, and emotional support.
Whatever cuteness that may have existed before has warped into six unique brands of derangement. Delusional about their prospects in the job and dating world, each brother is a remarkable piece of shit. With no money and less empathy, they backstab and attack each other at every opportunity. There are constant chances for redemption. Chances for one of them to break out of their self-imposed asylum and become more than just a porn-obsessed gambling addict are abundant, but always turned down, because fucking over the family member that betrayed them slightly is too great.