Samurai Ragazzi
Samurai Ragazzi - Sengoku Shounen Seihou Kenbunroku

After Nobunaga is removed from power, signs of civil unrest reach even the distant region of Kyushu. There, the Harima family rules a small domain under fifteen-year-old Harunobu, who has little interest in warfare or lordship. Rather than prepare for conflict, he surveys the land, maps its features, and records its plants and animals. Harunobu dreams of creating an encyclopedia containing all the world's knowledge. When the chance arises to travel the world and eventually reach Rome, he entrusts his domain to capable hands and sets sail on the journey he has long dreamed of.