Watch The Deep Blue Sea for Free: How to Stream the Movie Online at 123Movies. . To fulfill a friend’s dying wish, a young sailor Kenji takes on the task of delivering an heirloom to his friend’s daughter, Harumi, who has been adopted by another family. When he arrives, Kenji soon discovers that Harumi and her adopted family are the targets of an evil gang boss. In an attempt to help them, he decides to take matters into his own hands.