Punpun is a socially awkward young boy whose age of innocence ends with his parents' divorce. As he continues to mature and interact with people around him as the average boy would, such as dealing with crushes and getting into mischief with his classmates, he begins to learn how crushing and harsh reality can be and struggles to find his purpose in the world.

Spoiler

As Punpun grows older, his appearance changes drastically based on how he views himself.