Sueharu thought he had carried out his plan to perfection at the confession festival, but what he thought was just a little idea of his own ended up involving everyone around him, and when he confessed to Kuroha, she rejected him. Kuroha answered his feelings with a hard no, and Shirokusa had to hear him say that he "was" in love with her, but no longer is. And now, a newcomer is about to make this love triangle even more complicated...

Kuroha's younger sisters abruptly visit Sueharu's house to tell him that she has developed amnesia. All her memories from summer break onward are gone, and they stop right when she was about to confess to Sueharu. So she suggests starting over from the moment of her own confession and erasing everything she did during the cultural festival. But Kuroha's behavior is making Shirokusa suspicious...

Sueharu has learned that Kuroha was lying about her amnesia. He asks her why she lied to him, but she refuses to tell him the truth. To Shirokusa, their fight just looks like flirting, and she realizes that the distance between Sueharu and Kuroha has returned to where it was before the confession festival. Unable to let the trend continue, she secretly sets a new plan in motion.

On the way to Shirokusa's villa, an argument between Maria and Shirokusa evolves into the decision to have a cooking contest. The girls seem excited to shop for ingredients. As he watches them Sueharu thinks of Kuroha, who hasn't arrived yet. At the same time, Kuroha worries about Sueharu and the studying he needs to do during their trip. Sueharu knows nothing of their worries as he has fun playing on the beach, but then Shirokusa sends him a message asking him to meet her in secret.

After playing throughout their first day in Okinawa, Sueharu is exhausted and falls asleep hard. When he wakes up, an angry Kuroha and her sisters stand before him! What's more, Kuroha senses that the distance between Sueharu and Shirokusa has grown smaller, so she decides to make up for the time lost due to her delayed arrival by coming on to Sueharu with all the appeal she can lay on him. Can Sueharu withstand the fierce attack of "Alter Kuroha"?!

At the end of the Okinawa trip, Sueharu was injured catching Shirokusa in a fall. So Shirokusa decides to stay at his house for a while to care for him, pleased with the chance to get ahead of the other two girls. But Shion, the maid accompanying Shirokusa, has harsh words for Sueharu with regard to his half-hearted attitude toward everyone. The next day, Maria starts attending their school, creating a harem around Sueharu that earns him the contempt of all the other boys.