Exasperated that Tohru is still using her school swimsuit at the pool, Arisa and Saki decide to buy a new swimsuit for her. Yuki and Kyo are forced to come along but their input was made moot when the girls decided to get a pink swimsuit. While having soba for lunch, Arisa recalls how she first met Tohru in middle school. Back when she was still in a violent street gang, her idol was the Crimson Butterfly who had since become a mother and had a daughter who goes to the same school as Arisa. However she was shocked that the Butterfly's daughter turned out to be a plain, strange, spaced out girl, and Kyoko (the Crimson Butterfly) became a doting parent...