Mono Gokoro, Mono Musume.
Similar to the protagonist of Henshin!, Hiroaki gains the power of transformation, but unlike Sakagami's power to transform himself into anything, Hiroaki can transform anything into a girl!
He gains this power by opening a strange attachment in his computer. Which suddenly turns his computer into a girl. She tells him that anything he 'personifies' will become his willing servant as well.
(Source: VNDB)
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