Set in a high fantasy universe, the series follows three heroes as they attempt to prevent an empire from conquering the world with the power of an ancient flying fortress. Web Series adaptation of the video game, Secret of Mana. The Trials of Mana is a 9 episode long story that focuses on the events from around 2/3 of the way through Secret of Mana, with the emphasis being on the trials set by Sage Joch for the heroes to learn the true meaning of courage.