Tale of Sea King Review
Tale of Sea King aka Kaiouki by Masatoshi Kawahara is a story about a mysterious captain of 8th  "Shadow Ship" (or Phantom ship, I don't know the right translation), Fan Gamma Bizen, his crew, guests above his ship (Maia, Meldaza, Tuban, Woll Shei Ron, Sariu, etc). The stories which, initially seemed to be episodic tales, are actually interconnected for struggles against imperialist Ronaldia Empire which mastered gunpowder weapons. While initially the setting looks like Standard European Medieval Fantasy, it is actually post-apocalyptic world with history similar to our timeline's.

Character  

 Fan Gamma Bizen 

A mysterious captain 8th Shadow Ship. Beneath his usual slothful attitude, he is really brilliant naval commander and expert fighter, both unarmed and with Katana blade. He has a pet Sea Falcon named Rufa. As 8th (or officially, 0th) Shadow Ship has no official they must watch, their duty is gathering intelligence of potential threat on Sea Tribe as a whole. Fan identified that that the threat for current era as gunpowder-wielding Ronaldia Empire which threaten Sea Tribe's domination on sea. 

He later reveals that he is one of the potential heir for eponymous title of Sea King when old Sea King passed away and election for new Sea King is held. Fan himself doesn't know nor doesn't care if he is previous Sea King's son and says so. He lost the election race but new Sea King gives him prestigious but empty Grand Sea Admiral. As he has access to records of history similar to our timeline's, he nonchalantly mentioned Mehmet the Conqqueror and Turkish feat of moving ships above land in Siege of Constantinople (1453), he finds a method or two to fight cannon-armed Ronaldian Navy without access to any guns.