A middle schooler's chance discovery of a haunted go board connects him to Fujiwara no Sai, the ghost of a Heian-era go master with an unfinished obsession. What begins as reluctant cooperation gradually transforms into genuine competitive drive, fueled by a rivalry with a gifted young prodigy. This beloved series brought renewed attention to the ancient board game and remains a touchstone for Tokyo's vibrant go culture, with the Nihon Ki-in headquarters in Ichigaya well worth a visit for fans.