Ok I decided to write also in Italian to have clearer ideas.

All countries in the book

Russia 🇷🇺 (male)
America 🇺🇸 (male)
Italy 🇮🇹 (male)
Greece (female)
Germany 🇩🇪 (male)
Poland 🇵🇱 (female)
Spain 🇪🇸 (male)
Japan 🇯🇵 (female)
South Korea 🇰🇷 (male)
Canada 🇨🇦 (male)
Australia 🇦🇺 (male)
Ukraine 🇺🇦 (female)
Belarus 🇧🇾 (female)
Kazakhstan 🇰🇿 (male)
Turkey 🇹🇷 (male)
China 🇨🇳 (male)
Vietnam 🇻🇳 (male)
Third Reich / Nazi (male)
USSR / Soviet (male)
UK 🇬🇧 (male)
France 🇫🇷 (female)
Portugal 🇵🇹 (male)
Brazil 🇧🇷 (male)
Argentina 🇦🇷 (female)
Estonia 🇪🇪 (female)
Latvia 🇱🇻 (male)
Lithuania 🇱🇹 (female)
Finland 🇫🇮 (male)
Sweden 🇸🇪 (male)
Norway 🇳🇴 (female)
Indonesia 🇮🇩 (female)
Malaysia 🇲🇾 (male)

Ship in the book
🇷🇺 / 🇺🇸
🇮🇹 / 🇬🇷
🇩🇪 / 🇵🇱
🇯🇵 / 🇰🇷
🇪🇸 / 🇵🇹
🇨🇦 / 🇺🇦
🇨🇳 / 🇻🇳
USSR / T. Reich
🇬🇧 / 🇫🇷
🇧🇷 / 🇦🇷
🇫🇮 / 🇪🇪
🇱🇻 / 🇱🇹
🇸🇪 / 🇳🇴

They are fourteen years old
Italian school system
No blood and depression 😊👌🏻
Sorry if sometimes I don't get a good name for the chapters
I will use google translate for something