カチューシャ

KACHU-SYA was a vocal unit formed in 2004 to perform the theme songs for Kakyuusei 2 and its TV anime adaptation Kakyuusei 2 ~Hitomi no naka no Shoujo-tachi~.

The group's name comes from the names of its' initial line-up:
KA: Kawaragi Shiho, CHU: Nakajima Saki (from the on'yomi reading of 中), S from each member's initial, and YA from Miyano Shizu.

A second iteration of the group, known as KACHU-SYA 2nd was formed in 2006 for performing the theme songs for the H-OVA adaptation Kakyuusei 2: Anthology. Its members were Kawaragi Shiho, Inokuchi Yuka, and Ikeda Hikaru.

The group is no longer active, however, the original KACHU-SYA was a guest performer under the name Kachu~sya?! for seiyuu vocal duo pink☆away's debut live event on July 18 2010.