The title you've mentioned, Shiroi Heya: Mukanjou Bakunyuu, is a Japanese adult manga (doujinshi) and animated adaptation (hentai) by the artist/circle

The story follows a young man who finds himself in a mysterious "white room" ( Shiroi Heya

: It utilizes the "trapped in a room" trope, common in the genre to isolate characters and focus entirely on the physical progression between them.

: While starting with a cold, clinical atmosphere due to the setting and the girl's demeanor, it typically follows a path of increasing intensity. Content Warning This title is strictly adult-oriented (18+)