Deathopia Final by Gaia - Adult Sex Game

Seiji is a teacher at the West Star Academy with a secret agenda - to take revenge on a female teacher Ruriko for some slight she did to him. Natheless, revenge is dish best served cold, and Seiji first intends to corrupt and turn into the sex slaves three of Ruriko's favorite students Sae, Chisato and Manami using drugs and hypnosis. To that end he gets the help of a yakuza boss Ryouji and another student Yuriko.​