En espaņol: http://hikariproject2espanol.smackjeeves.com/

Hikari Project is about two girls, Hikari and Luz, who are supposed to be identical twins. But while Hikari has a normal life, goes to school and has friends, Luz on the other hand is not allowed to leave home, go to school, or even let anyone from the family see her.
This is because Luz is a clone of Hikari, created with the sole purpose of giving her vital internal organs to Hikari in order to keep her "sister" alive.