Title: Koga Kubou (1535 - 1552)

Haruuji was born eldest son to Ashikaga Takamoto. He formed an alliance with Houjou Ujitsuna in 1538 and married his daughter Houjunin. However, he was hostile towards Ujitsuna's successor Houjou Ujiyasu, and formed an alliance with Ougigayatsu-Uesugi Tomosada and Yamanouchi-Uesugi Norimasa. He joined them in a attack on the Houjou in the Battle of Kawagoe Castle in 1546, the loss of which deprived him of the power of Koga Kubou. He was forced to confer that title on his second son Ashikaga Yoshiuji (whose mother was Houjunin) in 1552. Two years later, his castle at Koga was attacked by Ujiyasu, and he was confined to Hatano in Sagami. He was allowed to return to Koga Castle in 1557, but was confined to Kurihashi Castle when the coup he was planning to bring his eldest son Ashikaga Fujiuji back to power came to light.

He died in 1560 at the age of 53.