The second season of Tales of Zestiria the Cross.

Hundreds of years after the large-scale battle against the Nokkers in the city of Renril, the world is unrecognizable. Thanks to the immortal Fushi's efforts in dormancy, he has successfully created a world with modern infrastructure where he and every living species can live in peace. When he finally awakens from his slumber, Fushi is elated to try everything this new world has to offer and revive his friends from the past. While exploring, Fushi runs into Yuuki Aoki, a lively middle school student, who is quick to welcome him and his friends into the house. As the group settles into their new home and learns more about the modern world, Fushi meets Mizuha, Yuuki's friend, who resembles someone familiar to him. It turns out that Mizuha is the descendant of the Guardians: the people whose only goal is to keep Fushi safe. Like her ancestors, she grows fond of Fushi, which brightens up her life. However, as bizarre events occur when Mizuha approaches Fushi, it becomes clear that this new world is far from perfect.

A new Holy Grail War is emerging in Snowfield, Nevada, where mages from around the world summon Servants, heroic spirits drawn from myth and history, to fight on their behalf. However, this war seems to differ from previous ones. The organization behind it appears to have used data from the Fuyuki Grail War for their ritual, resulting in strange happenings. Unbeknownst to most participants, this budding conflict is actually a fake Grail War. There exists another set of seven true Servants who are summoned to fight in the genuine Holy Grail War. One of these Servants is a powerful Saber-class who saves the life of Ayaka Sajou, his apparent master, after being summoned. With hidden agendas and unpredictable forces at play, the line between the fake and true Grail War becomes unclear, turning Snowfield into a dangerous battlefield.

When humanity was oppressed by mysterious foes known as the Celestial Hosts, five exceptional mages joined forces to defeat them. In fear that these formidable enemies would return, the five most powerful mages, known as the Magia Vander, built a magical dome and a tower to contain them. Since then, the five strongest mages of every generation are tasked with monitoring the dome from the top of the Wizard's Tower. Inspired by this story, childhood friends Will Serfort and Elfaria Albis Serfort promised each other that they would climb to the top of the Wizard's Tower. However, now a sixth-year student at Regarden Magic Academy, Will's future looks bleak. Although Elfaria managed to join the ranks of the Magia Vander five years prior thanks to her unparalleled magical power, Will has no magical abilities whatsoever, attracting the ire of teachers and students alike. However, blessed with an exceptional physique, Will is able to slay monsters in the labyrinth and prevail against skilled magicians with the only aid of his sword and a few magical items. Determined to climb the Wizard's Tower at all cost, Will is determined to not let anyone or anything prevent him from keeping the promise he made to Elfaria.