The entire show has an eerie art style, further made worse by the dim locations and incredibly slow pace.
Most of the characters we follow are presented either as nihilists or psychopaths. Even the main character, Ichise, seems to act like an obedient dog with very little agency. Only a few minor characters seem to exhibit any kind of nobility or humanity.
While the whole show is depressing from start to finish, the remaining three episodes are devoid of any hope.
The setting is dark and dystopian. Onishi ruthlessly kills someone. Some other instances of intense violence. The car sex scene can be discomferting. A girl loses the will to live after being gang raped off-screen, very upsetting.