Harahara sensei, 4

Azusa, Yoroizuka, and the others attempt to contact the mysterious man, seeking clues about the chemist behind Kogami. Meanwhile, Inaba—still harboring dark feelings toward Azusa—steadily advances the development of a terrifying chemical weapon. Can they thwart Kogami’s plan before the fateful confrontation takes place? Azusa and Inaba, Yoroizuka and Kogami: once again, they face the nemesis who upended their lives and put an end to their abominable past!