Kotaro is a college graduate from the University of Tokyo that he alone payed his own school fee due to his parents passed away during his first year of college resulting his uncle to adopt him; but at the end his by himself because of the behavior of his uncle towards him being cruel. on a faithful day Kotaro after the day of his graduation; Kotaro got an email from a company that accepting fresh graduates saying that he is welcome to be their youngest commander in training because of his admirable school records. Not wanting to miss his chance; Kotaro accepted the invitetion and goes to the building where the employer might be but a sudden accident happened on his way to the meeting place and was shot unintentionally during a gun fight. as a result Kotaro was now living in a world where Warships and Submarines are alive and having an endless war to each fleet as part of a daily basis, what awaits our protagonist might change his life "for the better or for the worst".
3 parts