Big Comic Spirits is a weekly Japanese seinen manga magazine published by Shogakukan. The first issue was published on October 14, 1980. Food, sports, romance and business are recurring themes in the magazine, and the stories often question conventional values. The magazine is published every Monday. Circulation in 2008 averaged over 300,000 copies, but by 2015 had dropped to 168,250. In 2009, Shogakukan launched a sister magazine, Monthly Big Comic Spirits.

Asadora! is a Japanese manga series written and illustrated by Naoki Urasawa. It has been serialized in Shogakukan's Weekly Big Comic Spirits since October 2018, with its chapters published in eight tankōbon volumes as of December 2023. It has been licensed for English release in North America by Viz Media.