Set in 15th-century Europe during the early stirrings of the Copernican revolution, this historical manga centers on a young peasant boy named Petrus who becomes obsessed with a forbidden idea: that the Earth moves around the Sun. Grounded in meticulous research, it portrays the quiet, dangerous work of early scientists who risked everything to pursue truth in an age governed by religious doctrine. A thoughtful read for anyone drawn to the intellectual history that shaped the modern world.