Aoba is a young girl who loves to build models of robots. She lived alone with her grandmother until her grandmother passes away. Shortly after she is kidnapped and brought to a secret base where she discovers a huge robot. The piloted robots fight against Ancient-Jinki in The Grand Savanna, but the true meaning behind the fights is hidden. Aoba works hard at the base so one day she can pilot one of the robots and discover these secrets.

Long ago, the king of Orvelia, Kyle, defeated the demon king Angmund and brought peace to the world. However, one hundred years later, demons have been sighted in the forests, threatening humanity once more. A scouting expedition is sent to verify the claim but only one member returns. Meanwhile, Riheet, the leader of a dark elf mercenary group, plots to take over Orvelia to exact revenge against the humans who forsook their race a century ago. The knight apprentice Kasel, accompanied by the priestess Frey, sets out to rescue Clause, an old friend who went missing in the tragic mission. However, along the way, Kasel discovers that he is the son of the revered King Kyle and the only one who can wield the Holy Sword Aea—the same sword that slew the demon king. To fulfill this destiny, the young knight must embark on a perilous quest, unseal the sword, and end the fear instilled by demons. As Kasel's journey to bring hope to humanity and Riheet's vow for vengeance intertwine, what fate could possibly await them? [Written by MAL Rewrite]

Recap of the first twelve episodes of Ensemble Stars!

After an invasion by the Vivolian army, the Sprite Himawari and her childhood friend Tsubaki flee their homeland of Floria for the town of Romton. There, they live out their lives in peace... for a time. One day, Himawari's friend and fellow Sprite Ajisai is kidnapped by mysterious strangers. Now Himawari and detective Tsubaki set out to rescue her, but find the dreaded Vivolians standing in their way! A 2D animated special episode aired on the Monster Strike anime channel, promoting the Monster Strike game debut of the Flower 4 series. Despite this, the storyline is standalone and unrelated to previous Monster Strike anime installments.