Mayoi Kyonshî Sono Ichi

August 20th. It's the last day of the summer vacation. Koyomi met Yotsugi Ononogi again when he was looking for Mayoi to give her big backpack she forgot at his house. After he got home, Shinobu points out that Koyomi hasn't do his homework yet. He wants her to go back to yesterday with her power.