Extremely Red Red Eye

Japan has been under the constant threat of giant monster attacks for a number of years, with giant heroes employed by the monster defense agency Midas only barely holding off the attacks.

The one-legged girl Aki moves to the new seaside capital Isora after she is saved by the strongest hero Red Eye. She has an unfortunate encounter with a mysterious boy named Gaito, and later finds out that he is in fact her long-admired hero Red Eye. (ANN)