Description

In the near future, much of the planet has sunk into the sea for reasons unknown.

Having suffered an accident that cost him his leg at a young age, Ikaruga Natsuki decided to abandon his life in the city and move to a seaside town.

Lacking any relatives, he was only left with his submarine biologist grandmother's ship, submarine, and debt.

In hopes of regaining his "lost future", he teams up with enigmatic debt collector Catherine, setting his sights on the seabed warehouse he inherited upon the death of his grandmother.

But what they found there was a coffin-esque device sheltering a sleeping child of breathtaking beauty--Atori.

A robot brimming with emotions that anyone would mistake for a real human. Atori, who was salvaged from the bottom of the sea, declared:

"I must fulfill my master's final wish. Until then, I ask for your help, Natsuki!"

In a peaceful town sinking into the sea, an unforgettable summer for the boy and the robot girl begins...