An aged man with a high class aura about him. Dresses in cleanly ironed out formal suits, and wears thin spectacles. He has a neatly trimmed beard and mustache, and stress lines are evident on his forehead. His hair short and is cleanly parted slightly towards the right.
He is a ruthless and unforgiving man. He does not tolerate any form of insubordination and will not hesitate to strike a punishment wherever he sees fit. He has a cold and calculating appearance, and never smiles. As the chairman of Aihara Academy, he deems it necessary to discipline the school as much as possible to uphold their high status image. He is seen to have a similar outlook as Mitsuko Taniguchi, the ex school president who ran the school on a policy of fear.
Despite his unnerving appearance however, he does believe in second chances. He forgave Yuzu for her unruly behavior at the school gate when she called him "grandfather" and well as her outburst in their assembly. However he expelled her when he saw her half stripped on Mei's bed with Mei. However he did later allow her to re attend the school due to her phoning an ambulance for him.
Although he has a strictly business attitude, he knows he is not above forgiving others.
Yuzu first meets him in chapter 2 where he introduces herself as his granddaughter, much to his anger. Later she does the same thing during assembly, causing his patience to run dangerously thin.
During her attempt to convince Mei to live with her again in chapter 3, Mei pushes her on a bed and begins to strip her. Yuzu just grabs Mei's hand and tells her everything is going to be okay. At this point, the chairman walks in to see a half naked Yuzu on the bed with Mei. Completely enraged, he expels her from the Academy.
Later on in the same chapter, she visits the chairman's house once more to convince Mei to come back home, and to convince the chairman to let her attend the school once more. She walks into his office to find him passed out on the floor, and quickly dials 911 (although we never get to see her dialing for an ambulance). The chairman, now grateful to Yuzu for calling the ambulance, revokes her expulsion.
Mei Aihara - Biological granddaughter. She is the heir to the academy.
Yuzu Aihara - Surrogate granddaughter. She is only his granddaughter through his son's marriage to Yuzu's mother.
Shō Aihara - His son. Shō left 5 years ago (in the manga) to go on a world tour. He has since given up all right to run the Academy after his father.
Yuzu's Mother - His daughter-in-law. It is unknown if they have ever met.
"Begone!" - To Yuzu in chapter 2 after she declares him to be her grand father.