The series is set in a near-future world where the boundary between human being and AI is vague. A rapid biological evolution, similar to "Cambrian Explosion," is caused by one incident. This incident turns into the genesis of a new jostle for supremacy, and the influence of the evolution goes beyond biological framework and spreads to various kinds of materials and technologies. The era of massive evolution involving diverse existences, such as human, machines, and biotechnologies, is coming. Characters fight an existential war in such a world. (Source: ANN)

Aichi and his friends have won the National Tournament and decide to go their own ways until a mysterious boy named Takuto Tatsunagi appears. He reveals that the Royal Paladins, Dark Paladins, and Kagero leaders have been captured, and the only way to free Cray is for the Vanguard fighters to use a new power- Limit Break. Because the Royal Paladins lose the ability to fight, Aichi's deck is changed to be a Gold Paladin deck. Aichi and his friends must now win the Vanguard VF Circuit if they are to learn more about the occurrences on Cray and free their old friends. (Source: ANN)

A behind the scenes special of all the main characters in Amaenaide yo!! Katsu!!, where they give their own personal feelings about their past experiences with the show, as well as their working experiences with their fellow cast members.

Haruto Kirishima lived a calm life out in the countryside, away from the fast-paced life of the city. Then Yuzuki Eba appeared in his life out of nowhere, having come from Tokyo to briefly live with her family. Their time together left him enamored with the memories of that short period before she just as abruptly disappeared from his life, and left him full of questions. Kimi no Iru Machi begins some time later, after Haruto moves to Tokyo to live with his sister, in order to pursue a career as a cook. In reality though he wishes to be with Yuzuki. Things don't start good though. When he arrives he is mistaken for a burglar and attacked by his sister's neighbour Mishima Asuka. After the misunderstanding is cleared his feelings begin to waver though. Is Eba, who keeps avoiding him for seemingly no reason, the one for him or is it Asuka?