Well, I don't actually know the specific 'pirate boy story' as you haven't given more details. It could be about a young boy who becomes a pirate, maybe he goes on adventures, looks for treasures and battles with other pirates on the high seas.
The main character is the pirate boy, no doubt. There could be a female pirate in the story as well, who might be tough and independent, and at first be a bit of an adversary to the boy but later becomes an ally. There might also be a ship's cook, who is known for his delicious but strange - looking meals. And then there could be a character who is a stowaway on the ship, a young girl or boy who the pirate boy discovers and has to deal with, whether to turn them in or protect them.
I don't have the exact name of the person who created the Omori manga at hand. It could be worth doing a search on manga databases or asking fellow manga enthusiasts for the answer.
Omori is purely fictional. The story and characters were imagined by the creators, not drawn from real-life events. It offers a fantastical and imaginative experience for players.
At the moment, there's no definite date for the Omori manga release. But you can follow the official social media accounts or manga forums for any potential news or leaks.