tomorrows book

Our main character, who doesn''''t remember his name, was a human on earth. then he chokes to death. on air. quite an embarrassing fate, but that''''s not important. due to a disturbance on two planets, which are Linked through a path of mana, our main character gets dragged into this world... reincarnated as a almighty Draconic Sea Sovereign... but he has to be careful, for this worlds oceans are treacherous. will he climb his way up to the apex, or will he perish?