It is a love story between two characters who have not seen each other in years but were once childhood friends. Literally translated, the title means "Bluer Than Indigo".Kaoru Hanabishi, a university student, is the eldest son of Yūji Hanabishi, the head of the Hanabishi Zaibatsu, and was set to take over the zaibatsu after his father retired. His mother, Kumi Honjō, and his father never married, making life difficult for both him and his mother. Kaoru's father died when he was five years old. Since then, Yūji's father, Gen'ichiro Hanabishi, took Kaoru under his wing and began educating him for the eventual succession. However, Kaoru never felt at home in the Hanabishi family and exiled himself after his mother's death. Day by day he felt alone, thinking that he was living life with no reason pushing him on. There was, however, a person who loved Kaoru so much that she had to do whatever was necessary to be with him. Her name is Aoi Sakuraba. Aoi is the only daughter of the owner of the Sakuraba Dry Goods Store (later renamed to Sakuraba Department Store). Kaoru's family and Aoi's family had expected for Kaoru to marry Aoi, but after Kaoru left, the marriage was canceled. Both families had a friendly relationship, and unaware to Kaoru, Aoi had been in love with him from the start. The Sakuraba family had already been searching for someone suitable, but Aoi was unwilling to marry someone else and walked out, chasing Kaoru. Both were freed from their families' affairs but did not know how to make their living. Miyabi Kagurazaki, Aoi's caretaker, has Aoi live with her in a grand western style summer mansion owned by the Sakuraba family with Kaoru living in a house for servants next to it to prevent a scandal as with the previous. They are soon joined by Tina Foster, an American expatriate; Taeko Minazuki, a clumsy housekeeper; Mayu Miyuki, Kaoru's childhood friend; and Chika Minazuki, Taeko's cousin. The house is eventually converted to a dormitory and Aoi becomes i