Rin's Hakamairi was uploaded first on January 17th while Len's "answer/reply song" to Hakamairi was uploaded not too long after on January 21st. A day after Len's Riimakaha was uploaded, the song Hakaokuri no Uta was uploaded, which is the combination of the two songs. This is Mayuko's most notable work; and her first work to have reached Nico Hall of Fame (exceeding 100,000 views). Most of Mayuko's works involves Japanese folk stories; Hakamairi and Riimakaha are no exception.