Heroine in Grave Danger!! 14 - Sailor Sathers (2018)

Sailor Rion solely fights with monsters who attack humans. Monster Sisters from hell come to defeat Sailor Rion. A college woman Aki Uozumi encounters the site where Sailor Rion has her energy absorbed by Monster Sisters that returns her to human appearance Jun Shido. Jun still has to fight the Monsters Sisters and Aki gets the power to transform into Sailor Paisis to come to her aid.