Amamiya Yuuhi, an average college student, wakes up one morning to the sight of Neu Crescent, a talking lizard claiming to be a knight. Neu asks for him to help save the world and protect their princess from an evil mage seeking to destroy the Earth, but Yuuhi finds it hard to believe such an absurd request. However, later that day a golem created by the evil mage appears before Yuuhi. Yuuhi is about to die when suddenly—

Yuuhi learns of the reason Samidare wishes to destroy the Earth, and he continues to train himself every day in order to hone his new powers. However, the "discipline" Yuuhi received from his grandfather continues to bind him like cursed chains. During that time, Yuuhi receives word from his home that his grandfather has fallen ill and been hospitalized—

Yuuhi struggles to cope with Hangetsu's death and actually fight as new Beast Knights appear before him and Samidare, and band together to face the next golems.

Hangetsu's wish has both made Yuuhi stronger and made him a target for Mikazuki while the rest of the Beast Knights are brought together.

Yuuhi digs up a box buried in the mountains that contains a letter and a book for him which describes the life of the clairvoyant Swordfish Knight, Akitani Inatika.