Initially, the company focused on creating general adult games.

The brand name is derived from the meaning of “visual entertainment”. is an independent manufacturer from Heart Electronics Industry. After launching as a new brand of Heart Electronics Industry in 1992, I-One Co., Ltd. It is notable for developing eroge video games with 3D graphics. 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. ( Learn how and when to remove this template message)

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