Matryoshka: It is about a person who hides their true self and the outside of this matryoshka doll is depicted as a completely normal person, however, as each layer is gradually stripped, the true feelings are revealed and ultimately, the core, which is also represented by insanity, is exposed.
It is one of the most popular VOCALOID songs.The costumes used has become one of the most popular vocaloid cosplay. The Vocaloid Kagamine Rin cosplay costume can be found at www.eshopcos.com as following: