One day, cat detective Nanba Toraji, who hires people to search for lost cats, finds a handsome young man named Mao collapsed in a park. The mysterious Mao, who refuses to reveal his origins or even his real name, declares, "From today, I'm your cat," and not only does he stay at Tora's house, but he also offers to pay for his lodging with his body...!?

A heartwarming (?) love story between a tough cat detective and an innocent lost cat begins in a delightful way!