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?