The Legend of Heroes: Zero no Kiseki Playstory - Ring of Judgement (英雄伝説 零の軌跡プレストーリー ― 審判の指環) is a side-story manga of the Zero no Kiseki game. It was released by Dengeki Comics on December 18, 2010.
Summary[]
An original story about Estelle and Joshua's adventures that links from Trails in the Sky to Zero no Kiseki.