Motokiyo wished to serve under Hideyori TOYOTOMI at the Siege of Osaka occurred in 1614, but he became ill during the voyage to Osaka, and died on March 23 of the same year despite the medical treatment received at Kennin-ji Temple.
慶長19年（1614年）、大坂の陣では豊臣秀頼に属す事を願い大阪へ向かうが、その船中で発病、建仁寺での療養の甲斐なく、同年2月13日(旧暦)に死去した。