It seems that the central theme of the movie is first introduced when the Mitsuos are watching that philosophy…
Oh what a beautiful comment! Ty for this analysis, I've noticed Adam and Plato references, but didn't pay attention to the poster. I've came to find info about title meaning. I haven't read the manga, and my theory is it's mispronounced name Mitsuo (Mits as Mints)
For those who was upset by Looney's ending. The scriptwriter of PP wrote also script for Racket Boys (2021) and in the final episode there is a cameo of Looney. We don't know for 100% if this is the same character or not, but he mentions prison and partner who waits him in the car, there's also a funny moment with "doctor Go"
I've came to find info about title meaning. I haven't read the manga, and my theory is it's mispronounced name Mitsuo (Mits as Mints)