From Audiovisual Identity Database
Denpasoft is an imprint of translation company Sekai Project specialized in eroge and R18+ titles.
Logo: Over a white background is a silver-colored box, with a kawaii-styled bunny coming out of it, signals are seen coming out from its ears. Below is the gray text "Denpasoft".
Availability: It can be pretty hard to find as most titles distributed by Denpasoft either don't have this logo or have the Sekai Project one instead. It is seen on games like Amatsutsumi.