斑鳩 夏生

Natsuki is a student enrolled in an elite school known as "Academy", but has been absent for personal reasons. He has since moved away from the city to a seaside town alongside his grandmother.At a young age, he lost his mother and right leg in an accident, and suffered a seizure from the trauma alone in the dark.In order to buy a high-end robotic leg, he attempts to salvage his submarine biologist grandmother's heritage from the bottom of the ocean with her submarine.