In 1505, he became the family head by taking over as the head of the family from his older brother Korenaga ASO (Taketsune KIKUCHI) who seized the Kikuchi family of Higo no kuni Shugo (Provincial Constable of Higo Province).
1505年、肥後国守護の菊池家を乗っ取った兄・阿蘇惟長（菊池武経）に家督を譲られ、当主となる。