Story from Genji Agedama

ゲンジ通信あげだま

Agedama is a small boy going to elementary school and having the usual problems for a boy of his age. He is also secretly a superhero-in-training (called "Agedaman"). Along with Wapuro, his floating computer companion, he fights against a criminal organization who can turn humans into monsters of various types. (Source: AniDB)