Unitea is an average, peaceful village, and Mima is an average, optimistic, peace-loving girl. She has dreamed of becoming someone strong and heroic. Someone who could help those in their times of need. But in a town where nothing much ever happens, and having a not so useful power, she hasn't had much chance to change into that sort of person. Mima lives happily day by day with her friends despite that, thankful that nothing bad has come.  One day, an unfortunate event occurs. With this less than ideal circumstance, Mima and her friends must learn to bloom into the type of hero she had dreamt of for so long.