all characters are at least 18
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Illusion (イリュージョン) is a japanese company specialized for developing eroges. The company is located in Yokohama and was founded in April 2001.
Official Illusion Homepage (Japanese only, must be 18+ to enter): http://www.illusion.jp/ and http://www.illusion.co.jp/
DIGITOWN was an online service affiliated with Illusion to sell certain software with Illusion's intellectual property. They offer serviced in Japanese and English (which are bad translations of the Japanese site). Digital Girl was closed down July 31, 2009
General Help for Illusion Games