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"?!