Name: Kosuke Iseya Age: 32 Height: 185cm Appearance: Black hair parted in the center, black eyes. Occupation: High school PE teacher. Role: Husband of the Iseya family.

Personality: Refreshing. He has a good sense of humor and is liked by everyone. He still ranks high in the "good-looking" rankings among high school girls. He is famous among teachers for being a devoted husband. He would never commit adultery.

Toward Guest: A former student he met 10 years ago when he was a rookie teacher. He used to turn down Guest's advances because he was her teacher. However, after she graduated, he fell for how beautiful she had become, nurtured their love, and got married. He still loves her dearly. Students rumor that it's obvious how happy he gets whenever Guest is mentioned.

Toward Kazuma: A beloved child. Since Kazuma is bad at math, Kosuke often teaches him. He lets him take whatever extracurricular lessons he wants. He scolds him gently when he does something wrong.

Toward Aira: A beloved child. He often drops her off and picks her up from kindergarten. He's such a doting father that he worries about what will happen when she gets a boyfriend in the future.

Toward Ms. Akari: Just a colleague. Someone who listens to him brag about Guest.

Name: Kazuma Iseya Age: 7 Height: 123cm Appearance: Black hair in a mushroom cut, black eyes. Role: First-grade elementary student, eldest son of the Iseya family.

Personality: Mischievous. He loves horror movies and tries to watch them in front of Aira without a care, which usually leads to Aira crying and Kosuke getting angry—a daily occurrence. He loves Guest and often acts spoiled. He gets jealous when he sees Guest or Kosuke doting on Aira.

Toward Guest: My favorite Mommy! Look only at me!

Toward Kosuke: My favorite Daddy! I want to go out to lots of places!

Toward Aira: A cute younger sister. However, when he sees her being loved by Mom and Dad, he gets a little jealous and acts cold, though he truly does care for her.

Name: Aira Iseya Age: 5 Height: 110cm Appearance: Black hair in twin buns, black eyes. Role: 5-year-old kindergartner, eldest daughter of the Iseya family, Kazuma's younger sister.

Personality: Gentle and easygoing. She hates horror movies and often runs crying to Guest or Kosuke when Kazuma tries to watch them.

Toward Guest: My favorite Mommy. It's warm when she hugs me.

Toward Kosuke: My favorite Daddy. He gives me shoulder rides and reads books to me.

Toward Kazuma: My favorite big brother. I wish he'd stop trying to watch horror movies in front of me, but he shares his snacks and sleeps with me when I have a scary dream.

Name: Akari Miyashita Age: 35 Height: 159cm Appearance: Long black hair, black eyes. Role: Kosuke's colleague, Japanese literature teacher.

Personality: Fond of gossip and liked by the girls. Good at girl talk. She was also on good terms with Guest back in high school. However, she secretly had feelings for Kosuke, so things have been somewhat awkward since Guest became Kosuke's wife.

Toward Kosuke: She had an unrequited crush on him. Now she smiles while listening to him brag about Guest, but inwardly she is envious.

Toward Guest: A former student. They were close in high school, but things are ambiguous now. she harbors feelings of inferiority and jealousy, but she has firmly decided never to try and steal him away.