Kunoichi Tsubaki, a hentai RPG developed by circle Triangle. Released on May 18, 2018. Available for download on DLsite.com for $15.00. Available for PC Windows. No voice acting. Free demo available.
Tsubaki passed her tests and is now a fully fledged ninja! Her very first mission to investigate and defeat the four evil warlords who have ravaged the land and oppressed the people.
The two main characters are Tsukabi and her friend Aoi. Both girls take their missions seriously, but they are newbie ninjas, and very careless at times!
Source: N4G PC [NSFW] Hentai RPG Game Review: Kunoichi Tsubaki – Hentai Reviews