Chikasada was the 2nd son of Chosokabe Kunichika and Chosokabe Motochika's younger brother. In 1563 he was adopted into the Kira family of Tosa province, one of the Chosokabe's former rivals. In 1575 Ichijô Kanesada attempted to reestablish himself in Tosa province and Chikasada played an important role in defeating him. Afterwards Chikasada received the Hata district of Tosa but died of illness on 9 August 1576.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005