Magical Girl Incident, Vol. 1 (manga)

As a little boy, Sakura Hiromi once dreamed he could be a hero. Now...he's simply your everyday office worker, toiling away for the sake of his company. Though he longs for his childhood dream, it seems so far out of reach-until he decides to step up and save a child one fateful day.

Suddenly, fantasies become reality as Hiromi finds himself transformed into...a magical girl?!