Chi. Chikyuu no Undou ni Tsuite

Set in 15th-century Europe, Orb: On the Movements of the Earth follows a gifted young scholar whose future seems predetermined by the strict values of his age. Praised for his sharp mind and expected to pursue the most respected studies, he instead finds himself drawn toward a forbidden question—one that challenges what powerful institutions insist is absolute truth.

As curiosity turns into conviction, the series becomes a tense historical drama about the cost of seeking knowledge in a world that punishes doubt. With an atmosphere of danger and urgency, it explores reason versus faith, the politics of belief, and the quiet bravery it takes to keep searching when the truth itself can make you a target.