A knight dies in battle and is reborn as a behemoth cub, technically an S-ranked monster strong enough to level a kingdom, though he currently looks and acts like an ordinary kitten. Found by the elf adventurer Aria, who scoops him up and names him Tama without ever suspecting what he really is, he decides to just go along with being her pet. Between naps and belly rubs, his old knightly instincts stay very much intact, ready to surface the moment Aria actually needs protecting.