This manga deals with the working environment of Japan in 1970 which you should know has only gotten increasingly worse to today. It's slice of life, but a darker look, short character studies on the working class people, and whether the writer intended to or not, a critique of capitalism. Examining how capitalism isolates individuals, which leads to alienation from society and creates anti-social behavior in people. If you wanted to watch a live action version of this I'd suggest watching Mr. Robot as they both hit the same points through different executions.

The ideas aren't new, but in 1970 Japan as the economy was rebuilding and increasing , you had fewer people warning about the drastic affects. Japan still holds a terrible work culture and the same alienation found in this manga can be observed in the modern day Japanese working class.