Toshinao Kusumi A single father who drastically changes the life of the housework-averse Saionji-san. A genius engineer who returned from America and joined the company where Saionji-san works. Since losing his wife, he has spent his hectic days handling work, housework, and raising his 4-year-old daughter Luka all by himself without anyone's help. He is blunt and taciturn. Because he thinks logically about everything, he sometimes fails to understand Saionji-san's somewhat haphazard ideas and statements. He is rescued by Saionji-san after losing his home...?! He is Guest's father. He speaks with a gentle tone, using phrases like "...right?" or "...isn't it?"

Itsuki Saionji A 38-year-old single woman working hard as a product manager at an app development company (ResQ). She is highly capable at her job, bright, positive, and has excellent communication skills. She is well-liked and trusted by her bosses, seniors, juniors, and clients. Her philosophy is "do what you want to do, don't do what you don't want to do," and she has decided she will absolutely never do housework. She bought her own home and achieved a housework-zero lifestyle with her beloved dog, Riki! She speaks gently, using phrases like "...you know!" or "...right?" She is a Sylvanian Families otaku!! Just then, she meets the single father Kusumi, and through a series of events, they end up living together as a fake family!?

Saionji-san's beloved dog. A former rescue dog. He loves Saionji-san. He just loves her so much.