Call Ikki Katashima's "Serial Dad" by that name or by its literal English translation "Komori Life Improvement Club" - either way this is a dark but hilarious comedy. Based on the novel by Hikaru Murozumi about a disgruntled office manager who one day realizes that some people might just be better off dead "Serial Dad" delivers laughs by lampooning Martin Scorsese's "Taxi Driver" and the self-help movement.
Death by Hanging - Nagisa Oshima (1968)
Nagisa Oshima puts the questions the ethics of the death penalty in his 1968 film "Death by Hanging". Based on the true life case of Korean Chin-u Yi who in 1958 who was accused, tried and found guilty of killing a Japanese high school girl Oshima makes us complicit in the main character's punishment after he comes back to life after his execution and relives his crime.