”Chi.: Chikyuu no Undou ni Tsuite” (Orb: On the Movements of the Earth) is a compelling Japanese manga series written and illustrated by Uoto. Serialized in Shogakukan’s Weekly Big Comic Spirits from September 2020 to April 2022, the series spans eight volumes and has garnered critical acclaim for its profound exploration of scientific pursuit and religious dogma in 15th-century Europe.
Set in a time when heliocentric theories were deemed heretical, the narrative follows Rafal, a 12-year-old prodigy expected to study theology. His life takes a pivotal turn upon meeting Hubert, a former heretic who introduces him to the forbidden heliocentric model. This encounter ignites Rafal’s quest for truth, challenging the geocentric views upheld by the Church and risking persecution by the Inquisition.
The manga delves deep into the philosophical conflict between faith and reason. Rafal’s internal struggle mirrors the broader societal tension between established religious doctrines and emerging scientific discoveries. The series poignantly portrays the sacrifices made by individuals who dared to challenge prevailing beliefs in pursuit of knowledge.
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Critically, “Chi.” has been lauded for its narrative depth and historical authenticity. It won the 26th Tezuka Osamu Cultural Prize in 2022 and the 54th Seiun Award for Best Comic in 2023. Additionally, it secured second place in the 14th Manga Taishō and was nominated for several other prestigious awards.

In 2024, the manga was adapted into a 25-episode anime series by Madhouse, directed by Kenichi Shimizu. The adaptation received praise for its faithful representation of the source material and its atmospheric depiction of 15th-century Europe.
“Chi,” delves into the tension between established religious doctrines and emerging scientific discoveries. Rafal’s internal struggle mirrors the broader societal conflict, highlighting the personal sacrifices made for intellectual freedom and scientific progress. The series poignantly portrays the resilience of the human spirit in the face of oppression, serving as a timeless reminder of the importance of truth and knowledge.
For readers interested in a profound narrative that intertwines history, science, and philosophy, “Chi: Chikyuu no Undou ni Tsuite” offers a thought-provoking experience. Its exploration of the human spirit’s resilience in the face of oppression serves as a timeless reminder of the importance of intellectual freedom.