On the day of the raid on Kira-tei Residence by the Ako Roshi (lordless samurai of Ako Domain), Masamichi, who happened to be the tsukiban roju (monthly shift or duty of shogun's council of elders), quickly began dealing with the aftermath before Yoshiyasu YANAGISAWA came to the castle, and shown his shrewdness by making arrangements to not have the lordless samurai be executed immediately.
赤穂浪士による吉良邸討ち入りの当日、たまたま月番老中であった正往は、柳沢吉保が登城する前に事後処理を速やかに開始し、浪士たちが即刻処分がされることのないように配慮するなど、したたかなところも見せている。