I provided Mochila, a merengue song written in Spanish, released on 10/15/2017 and available for sale at 4 doujin events in Japan, the 3 remaining:
11/12/2017 THE VOCALOID M@STER 38
2/25/2018 VOCALOID PARADISE
4/8/2018 Minna no UTAU 2018
Thanks to Herozako for having me, Tsukonin A for the illustration, and everyone else for their contributions.