Mana Hirata

In the future — in a world mostly submerged underwater — the 19-year-old Sumeragi Aika goes to college while training as an agent by assisting in Aida Gozo's salvaging business.

A boy finds a strange object while playing hide-and-seek. His grandfather tells him the story of his own youth and the important role the old lamp played. This story is about the modernization of Japan and the changes that came with it.