Kusha-shū

The Kusha-shū was one of the six schools of Buddhism introduced to Japan during the Asuka and Nara periods. Along with the Jōjitsu-shū and the Risshū, it is a school of Nikaya Buddhism, which is sometimes derisively known to Mahayana Buddhism as "the Hinayana".
A Sarvastivada school, Kusha-shū focused on abhidharma analysis based on the Abhidharmakośa-bhāsya by the fourth-century Gandharan philosopher Vasubandhu. The school takes its name from that authoritative text.
Names commonly associated with the Kusha-shū are Dōshō, Chitsū, Chitatsu, and Genbō.