(which may be what "deep piece" in your query refers to, or a slight misremembering of the developer's name). Adult Visual Novel / Nukige (focused on sexual content).
These versions are often "All-Ages" or "Cero D" (17+) versions of the original PC adult games, meaning the explicit graphic content is usually removed or censored to comply with console manufacturing guidelines. imouto+bitch+ni+shiboraretai+portable
The phrase "Imouto Bitch ni Shiboraretai Portable" refers to a specific Japanese adult visual novel (eroge) or its PlayStation Portable (PSP) port. Meaning of the Title Imouto (妹): Younger sister. Bitch (ビッチ): (which may be what "deep piece" in your