Captain of Mirai, Umezu is a wise and respected commander who has the priority of the safety of his crew. He tries to prevent any possible changes in history, but after a time he  will agree more and more with Kadomatsu and begins the goal to save as many people as possible before the end of the war.

Mirai, an improved Kongou-class Aegis guided missile destroyer, is one of the newest and most advanced ships in the entire Japanese Self Defense Force (SDF). Her crew, also one of the newest, is lead by Capt. Umezu Saburo and Executive Officer Kadomatsu Yosuke. While running scheduled training exercises one day, Mirai encounters a fierce storm that throws their navigation systems into temporary disarray. After a few minutes of recovery, the crew is shocked to discover that they've been transported back in time to June 4, 1942&mdash;The Battle of Midway, during World War II. Letting history take its course for this battle, they manage to avoid the conflict firsthand and make a vow to remain annonymous, changing history as little as possible. However, when the crew comes across the dying Lt. Commander Kusaka Takumi, XO. Kadomatsu's instincts to save lives takes over, changing the course of history more than he could've imagined.
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(Source: Anime News Network)

[Wiki (jp)](https://ja.wikipedia.org/wiki/屋良有作)

In the year 200X, a Japanese fleet consisting of 3 vessels leave on a mission to South America. After encountering a storm, the ship JDS Mirai find themselves without their escorts and in 1942, traveling towards the island of Midway to face the American fleet in one of largest battles in naval history. The crew of MIrai must decide whether or not to change the course of history by involving itself in WWII.


Saburou Umezu