The main character, Yakumo, joins Yatagarasu and becomes a monster extermination specialist, where she’s charged with investigating a cult and the disappearance of other Yatagarasu members, working undercover in a brothel in the city of Innsmouth. Whether you fight or seduce your way through the game is up to you.
(overview taken from the ULMF thread. Here. Since there’s no English page for this)
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• Download and extract to desired location.
• Click on "game.exe" to start playing. With AppLocale of course.

• Dual Core Pentium or equivalent Processor.
• Intel HD 2000 or equivalent Graphics.
• 44.8 MB of free disk space (Recommended to have twice as much free disk space than this).