Natsuki Ikaruga

A former student of The Academy, an advanced school in the big city for only the brightest of students. After being forced out, he finds himself living back in the tiny coastal town his grandmother called home. Having lost his mother and his leg at a young age in an accident, he finds himself stricken with terror when forced into dark, silent spaces. In order to obtain the money for an advanced cybernetic leg, he buys into a plan to salvage a hidden treasure from his grandmother's sunken storehouse.