Ekoisuto

Kaikaiin Seika, an environmental scientist at Tokyo University of Science, is an ardent environmentalist who prioritizes research over love. But that is her daytime face. At night she has another face... as a legendary call girl! Numerous customers line up with offers to behold her beauty. Whenever a mysterious man called "Agent" sends her a job, she dresses up in a bewitching dress and goes out into the night... However, Seika isn't just a call girl working for money. Her real goal is to punish those powerful people who cause environmental destruction! For those who are doing damage to the Earth, she becomes an assassin who gives death as well as pleasure! A new kind of heroine who fights for the Earth day and night! Don't miss this new kind of sexy gekiga manga for the environmental age!

(Source: Nihonbungeisha, translated)