Kuroha's younger sisters suddenly show up into Sueharu's house.  According to them, Kuroha had lost his memory. According to Kuroha, she has no memory of the summer vacation, and his memory stopped on the moment she confessed to Sueharu... Therefore, Kuroha proposes to cancel her actions at the School Festival and start over from the time of her confession. However, Shirokusa is suspicious of Kuroha's behavior...

Sueharu discover that Kuroha's amnesia was a lie. Sueharu wonders why she lied to him and Kuroha who doesn't want to tell the truth. Seen from the outside, the two of them are just rowing for flirt-love, but for Shirokusa, it is noticed that the distance between Kuroha and Sueharu is returning to original all at once. Shirokusa realizes that it is not good at all, and go on a strategy behind the scenes.