Illusion (Japanese: イリュージョン, Hepburn: Iryūjon) was one of the adult video game brands of Japanese company I-One Co., Ltd. based in Yokohama. It is notable for developing eroge video games with 3D graphics. After launching as a new brand of Heart Electronics Industry in 1992, I-One Co., Ltd. was established in 1996 . Interheart Co., Ltd. is an independent manufacturer from Heart Electronics Industry. The brand name is derived from the meaning of “visual entertainment”. Source: Wikipedia (en)