Haruka Tomatsu
On Haruna's mini album "SxW EP" on February 22, 2017, she collaborated with Kotoko, Haruka Tomatsu, Rika Mayama, Sachika Misawa, and Akira from Disacode. The song that she made with Kotoko, "SxW -Soul World-", is used as the theme song of the game "".