A series in which an older sister who once wore bloomers when she was a student confesses her erotic acts at the time. This time, Mayu-chan, a G-cup busty beautiful sister who can be seen even from the top of her gym clothes. In her classes, she wore bloomers until the third grade of elementary school, and even after she abolished her bloomers, she even used them as inners for her school uniform skirts. While wearing such bloomers, she immerses herself in bloomers play while talking about the naughty acts she was secretly doing.
