"Shinobu Time, Part 4" (しのぶタイム 其ノ肆, Shinobu Taimu Sono Yon) is the twentieth episode of Monogatari Series Second Season, broadcast on November 16, 2013. Koyomi and Yotsugi's race against time to prevent the mysterious "darkness" from its ruthless pursuit has taken them to the front door of the "lady that knows everything", Izuko Gaen. As they face the harsh truth regarding their current dilemma, Mayoi Hachikuji makes a heart-shattering choice.