Naoko Suzuki

Aika is a skilled but impulsive high school student who earns a C-class salvager license yet struggles to find work due to her age and reputation. After advertising her services at school, she is hired by Erika, a wealthy student and leader of the Treasure Hunting Club. What begins as a simple salvage job quickly turns dangerous, leading Aika into a high-stakes mission, a clash in the southern islands, and the mystery surrounding a girl named Karen.

With Ami Koshimizu, Misato Fukuen, Mamiko Noto

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

With Ami Koshimizu, Miyuki Sawashiro, Misato Fukuen