anniversary of Yukio Mishima's death
Refers specifically to November 25, the date of Yukio Mishima's death in 1970. Used in contexts related to his memorial or legacy.
Every year on November 25, a gathering is held to remember Yukio Mishima on the anniversary of his death.
From 憂国 (yūkoku, 'patriotic concern') + 忌 (ki, 'mourning anniversary'). The term is associated with Yukio Mishima's death and his work 憂国 (Patriotism).