AIKa R-16: Virgin Mission

Aika, a high school girl who passed the salvagers license test with a C-class license, posts an ad in her school to attract clients due to her difficulties finding work. She's approached by Erika, the leader of the treasure hunting club, who asks Aika to salvage an item from the sea. Aika's task, however, involves a state-of-the-art submarine and a destination that exposes the true nature of her assignment, leading to a confrontation with a group of girls from the southern islands. Aika's encounter with Erika and her friends marks the beginning of a new challenge.