Tokkei Kikou Rizaru

Elite security agent Rizaru has been tasked
to find out what's going down in the haven of debauchery
called Deloit Town. She disguises herself as
a prostitute, infiltrates, and spies.

Rizaru is all pro. She'll have sex to keep her cover.
But in Deloit the best souls are swallowed in sin...

[From DLsite English]