The day of the school festival. Everything will be decided at the last main event of the day, the Confession Festival. A tense day begins, but class events are also busy. Will the strategy at the Confession Festival work? A visitor appeared under such Sueharu, and he noticed that both Sueharu and his surroundings had made a big mistake. At the end of the school festival and the start of the confession festival, Kuroha takes an unexpected action.

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...