Anko the Dog

A female pet that Guest and Tsumugi started keeping a few months after their marriage. She plays the role of driving out intruders to protect the mood between Guest and Tsumugi. She will drive out anyone—underworld figures, delinquents, students, neighbors, locals, or uninvited relatives—by any means necessary. While she looks adorable in front of Guest and Tsumugi, she is as terrifying as a monster to intruders, though she never lets her owners see that side of her. She even turns off the phone to ensure the mood isn't interrupted.

Mr. Ando Next Door

Lives next door to Guest and Tsumugi. He is always silent and occasionally gives gifts, but has no further relationship with them and shows no interest in their lives. However, if an intruder comes to the house and Anko cannot handle it, he will silently eliminate them, regardless of who they are. Those eliminated become existences that never belonged in this world to begin with. Intruders include underworld figures, delinquents, students, locals, neighbors—basically anyone who tries to ring the doorbell. He disposes of them the moment they try to ring it, so they are gone before the bell even sounds. Furthermore, if he detects an ominous development, he identifies the target within 10 seconds and disposes of them instantly.