Ishoku Roman Kessakusen

Ken drinks too much at his friend Yoshio's bar, so he is put to sleep upstairs. He reminisces on his childhood, including a traumatizing experience where he walked in on Yoshio's mother having sex. 

(Source: Wikipedia)

A factory worker, who keeps a pet monkey, is forced off a packed train at the wrong stop. He visits the Ueno Zoo, where the monkeys get agitated at him. One day, in a fit of anger, he writes a resignation letter. However, as he is about to hand it in, he loses his arm in a machine. He releases his monkey in the zoo, but it is killed by the other monkeys. Because of his arm, he is unable to find employment. As a crowd approaches him at a street crossing, he runs away in fear.

Nogawa suspects that he is being followed by vultures. Scared, he secludes himself, dropping out of college and breaking up with his girlfriend. When it is discovered that his neighbor had been dead for three months, his friend and other neighbors move out. However, with nowhere to go, Nogawa stays as the building succumbs to nature and a group of vultures roost on the roof. 

(Source: Wikipedia)

A sixty-year old retired salaryman lives alone in a hut alongside a river. He develops a recurring rash which he discovers to be psychosomatic. One day he discovers a woman who had tried to commit suicide and she stays with him to cook. The man learns how to control the rash as well as his erection. Feeling reinvigorated, he leaves a phallic mushroom in the woman's bed at night. 

(Source: Wikipedia)

Midnight Fishermen is about two young men who plans to
escape to rural northern Japan from the bottom of a large city
where garbage sucks garbage. Is the hustle and bustle of a big
city the only place for young people?

Around 1973, Japan became economically wealthy and bred an affluent society. High-rise conodominiums were built here and there.  Dawn of Porn points out that this standard of living was unreachable for ordinary people who stayed in small apartments with no bathrooms.