- Act 1 The story of Ririka and Haruna's older sisters Ririka and her caring older sister. Whether you're sneezing or watching a movie, the slightest thing can make you cringe. Haruna, her older sister, who is in a lot of trouble, prepares diapers for her younger sister. However, it was the first time for both of us, and we didn't really know what kind of diaper was perfect, so we struggled with cloth and paper. A smiling sisterly drama.