TTR Astronomical Club Special Investigation Team: Astronomical Special Endless Herbs (Pheremone).Without the constant medicine doses Izumiko had given him in the past, Itsuki becomes a confident fiend who can make women bow to him with his pheremones. As the others realise they need a drug to counter the effects of Itsuki's pheremones, Itsuki starts spreading his pheromones across the school, turning all the girls into loyal zombies. Kyoko develops a new batch of anti-pheremone and confronts Itsuki, but Izumiko stands in her way, allowing Itsuki to knock her out and escape with the anti-pheremone.