Weak Constitution (病弱, Byōjaku?) is a weakness struck by the nature of frail health. Similar in nature to Innocent Monster, where the perception of the people in the future affects the existence of the Heroic Spirit.[1]
Okita is accompanied by the risk of a sudden status drop at any time of every action. The probability of risk is not high, but when it is invoked in combat, it is immense.[1]
While normally this skill would be considered a demerit, the words and spirit of his mentor, Yoshida Shouin, have transformed it into The Yamato Spirit Lives On.