Magical Girl Incident (Manga) Vol 01

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?!  Yen Press
(W/A) Zero Akabane