|Measurements||Height: 167cm, Bust-Waist-Hips: 90-63-88cm|
|Hair||, Ankle Length, Blunt Bangs, Green, Hime Cut, Ponytail, Sidehair|
|Eyes||, Green, Tareme|
|Body||, Average Height, E+ Cup, Pale, Slim, Young-adult|
|Clothes||, Apron, Beanie, Clothing with Ribbons, Dress, Glasses, Oversized Clothing, Pantyhose, Pendant Necklace, Slippers, Sweater, Thigh-high Stockings, Towel|
|Personality||, Carefree, Clumsy, Docile, Kind, Low Self-esteem, Relaxed, Watashi|
|Role||, Full Sister, Head of Household, Older Sister, Pet Owner, Psychic|
|Engages in||, Cleaning, Cooking|
|Engages in (Sexual)||, Blowjob, Boobjob|
|Subject of (Sexual)||, Doggy Style|
|Visual novels||Main character - Popotan|
Main character - Popotan Fan Disc Issho ni A-SO-BO
|Voiced by||Fujisaki Mayu (PC)|
Oohara Sayaka (PS2)
Oldest sister and the present landlady of the mansion.
She is near-sighted and needs glasses to see clearly; in addition, she has no sense of direction. Ai is a motherly figure who constantly tries to help people. She does most of the chores their maid does not, and loves to cook despite being incompetent for that. Her easygoing, caring nature often leads her to fail at things because she cannot muster the resolve to criticize others. This is why she allows Chris to stay with them when she finds out he has nowhere else to go.
Believing she is ugly and fat, Ai hides herself behind her glasses and by wearing large, loose-fitting clothes. She also seems to be the de facto caretaker of her sisters' pet ferret, Unagi, which often hides under her hat. Ai also loves to take baths, more than once a day if possible. Ai has the ability to speak to plants, specifically dandelions, which she and her sisters refer to as "Popotan".