In a world where pet dogs and cats are humanized, who really owns whom?

Due to a declining birth rate, pets are being transformed into humanized members of society. But are they truly human? Or are humans truly animals?

Taika’s visit to the Tower of the Less-Than and its inhabitants leaves him questioning his own role and status in society. Meanwhile, brutal police officer Akutsu tries to pressure Tsunayoshi into doing his bidding, Ai finds a cryptic clue to her father’s murder in his study, and the Minami family hosts an unexpected guest.