Blue No.6: AO6

This story takes place in the first half of the 21st century, when mankind seeks a new place of survival under the sea, and is set in the unseen depths of the sea. Geos is an undersea terrorist organization that aims to build a deep-sea empire by conspiring to dominate the sea. Confronting the deep-sea competition with the AO submarine fleet , who risk their lives to challenge for the survival of mankind.
The legendary masterpiece depicting the romance of the sea that everyone has longed for is revived in the electronic version!