An ordinary man wakes up to find himself reincarnated from modern-day Japan to a foreign world int he body of a horse! To make the best of his situation, he accepts his fate and enjoys his new, carefree horse life in the forest. That is, until he rescues Lieutenant Commander Felix and is promptly horsenapped, made into his personal warhorse, and given the name Aleksei! Although Felix's training is sadistically strict, their days together showed Aleksei how devoted Felix truly is to his job and people, and Aleksei is ultimately moved by the proud and capable man. But when a terrifying incident once again puts Felix's life in danger, the truth hidden behind Aleksei's true form is finally revealed!
