I particularly like how the set-up and animation itself is portrayed, with the counting system that symbolizes the protagonist's emotional outbursts and how the "villain" of each season is inserted.
Nothing like the power of a sincerely spoken truth. Sometimes we pretend, lie and try to be something we never were, and the one we deceive the most is ourselves.
Who knew Master Reigen's "final lesson" was something he was learning himself: to be true to who you are about.