Born as a human with the heart of a fishman, Izuku has lived his life dreaming of a day where he can enact his adopted mother's wish to bring the residents of Fishman Island to the surface and live among the humans. However, his own heart holds him back. See as Izuku becomes a hero for not only humanity, but the fishmen and merfolk of his homeland.

After being abandoned by his mother for being quirkless, four year old Izuku midoriya is found by an elite military officer who trains him to be an elite soldier of the grand army of Japan, and after ten years and being on several dangerous missions, Izuku is sent to the USJ to rescue the students of class 1-A, as Izuku is assigned to watch over UA, the girls from 1-A, 1-B and even some pro heroines begen to have feelings for him but they are unaware that Izuku has a dark secret that could change everything, well Izuku be able to save the heros in time?, or well he aide in their destruction?...