Since his childhood, Levi lives with his grandfather who is a pirate. He passes the examination in the recruitment of members for the marine search and rescue team and joins the organisation. In order to improve team performance, the team leader arranges for a partner to work with Levi. At first, Levi dislikes his partner but slowly they develop close teamwork together. What will be Levi’s decision when he must choose whether to save the life of his sister or a stranger?