Chi - Chikyuu No Undou Ni TsuiteOrb: On the Movements of the Earth; チ。—地球の運動について—; O Ruchu Ziemi; Sobre o Movimento da Terra; Tierra, Sangre, Conocimiento: Sobre el Movimiento de la Tierra; Chi. -Về sự vận động của địa cầu-; 地。—關於地球的運動—; Du mouvement de la Terre (ki-oon)

The setting is 15th century Poland. It was a time when heretical ideas lead those to who possessed such a mindset to being burned at the stake for their beliefs. Rafal, a child prodigy, is expected to major in theology, the most important subject at the time, at the university. One day, however, he comes across a mysterious man, and is now studying a possible "truth" in the midst of heretical thought!