GHKR-16 Kuwakami Yua, Kugika Non, Yumemi Hinami: Beautiful Girl Warrior Sailor I ~The Codename is IST~ GIGA (GIGA)

Years ago, when Kuwakami Yua was active as the warrior Sailor Venus, she used the power of a light fairy living in her brooch to transform into the magical warrior Sailor Ishtal and protect the city from monster crimes. Together with her partner Risa, they formed a tag team and defeated various evil creatures. But then an escape incident occurred, and Risa disappeared. As Kuwakami pressed on with her duties, she began to suspect that her superior might be hiding something. Full of doubt and despair, Kuwakami is suddenly confronted by a female demon monster—Puripirio. To her shock, it's Risa, who has been brainwashed and grotesquely改造. [BAD END]