Airi Akitsuki

School and a member of light music club. She is the second daughter of Kayoko. She takes after the hair color of her biological father, and usually wears a pai style pigtails. Being only 14 years old, she has a small fch is offset nicely by an impressive pair of breasts, making her attractive and cute. Her personality is a tsundere towards her step father but she is warm and close to her sister Marina and mother. Although, on occasion she lets her true feelings out. In effect, she just wants to be content with her family, friendship with her sister, sex from her papa, and whatever the hell her mom provides. She shares her father with her sister and sometimes her best friend, but usually she likes to keep things personal with him, she will never admit to the fact that she enjoys sex with him though...as this is a common theme of the show. Therefore, the moments where she is having sex are depicted more as rape scenes. She eventually becomes much more docile and obedient towards Kōzō’s sexual abuse.

She is 14 years old in the first episode, making her the youngest of the family, and still just old enough for sex.

She doesn't like being told about Kōzō and she does not have a boyfriend.

In the OVA version, Kōzō rapes her, but not without first spraying an aphrodisiac that he himself developed in his laboratory. Though later on, its abundantly obvious that she enjoys sex with him (even though she cannot admit that to herself), and often even sees it as a form of bonding since the father is a sex friend; sex between the two becomes the pinnacle of their day-to-day relationships.