What You Need to Know: After years of analysis, Microsoft co-founder Paul Allen's team discovered the wreck of the Japanese battleship Musashi in 2015, 3,280 feet deep in the Philippine Sibuyan Sea.

Following Kojiro from his earliest days through his fateful meeting with Musashi, this movie is filled with exciting and dramatic moments culminating in the best version of the final duel ever ...

In the fourth installment, Musashi's potentially greatest opponent Kojiro jumps in and out of the story at the oddest and most coincidental moments. As his great love Otsu has succumbed to madness.