|Японское имя:||道明寺 司|
Tsukasa is the heir to Domyoji Enterprises, and his family is extremely rich. They own various houses around the world, including an actual island, a house in Canada, and a house in New York City where his parents stay.
Domyoji grew up somewhat lonely, as his parents were always overseas, and his sister--as loving as she could be--was either busy studying or, later in life, married and moved to Los Angeles. Also, his mother, Kaede, is cold to him, and although she loves him, wants to control his life. Tsukasa sometimes calls her "the old hag" and "witch".
Before he met Makino, he was violent and ill-tempered, but after he became loyal and nice.
As Tsukasa first stared of being hard and tuth to get though as the riter Hana Yori Dango showned us though out the episodes and reading tha book that any one who or stared of being hard can also find there sothed stop for love and that is showned though Tsuksas Domyji.