Based on the file naming convention and the title provided, this appears to be a specific release of a (or RPG) typically found on platforms like DLSite .
Based on the latest update (ID 2.1-6732e8c) for Tsumibukai Yokubou -Kumajin.com--tsumibukai-yokubou-id-2.1-6732e8c... UPD
: Usually distributed for Windows or Android platforms, often requiring specific drivers or viewing software provided by the host. Availability Doujin Visual Novel Based on the file naming
A broader look at the platform (Kumajin) or the genre of "tsumibukai yokubou" (sinful desires). -Kumajin.com--tsumibukai-yokubou-id-2.1-6732e8c... UPD