Toshiki Yui

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One of the better known mangaka in the erotic genre. Uses computer a lot for his color graphics.
Some of his early work was published under the name Masaki Katō. He has been publishing since 1986.

Yui is known for his computer-assisted drawings, manga, and web-images of pretty and sexy girls (bishojo). He specializes in romantic comedies, sometimes supernatural and often sexually explicit, about these girls and their male and female friends.

(Source: Wikipedia)