Into The Fantasy World as The Admiral of The Fleet

Y/N Yamamoto was a Tank Commander to Fighter Captain and become the General of The IJA(Imperial Japanese Army). But he actually didn't want to be promoted to higher ranks like his father that became the Commander in Chief of The Combining Fleet but died when someone assassinated him inside the plane then crashed and that instantly killed him much more. But this news reached Y/N in half year when he is just a tank commander but he led with the other soldiers that willing to follow him even if he isn't a higher rank to have his own army what he only need is trust from his people that wants to end the war fast but what he didn't know that the Emperor is watching every Y/N's moves and choices and that made the Emperor consider him to be the one and only to be the very first Imperial Grand Admiral of IJN Fleet. Well Y/N changed when he receives the news of the death of his father and that led him in rage and started attacking the enemy on foot,armor(tanks,armored cars, etc.),aircraft and naval ships...

Then everything change again on a day to celebrate the year of victory on the ships but a Terrible Storm happen that also made a huge whirlpool that led the ships to it. But in a new world has been discovered...