The series 'Haitoku no Kyoukai' delves into the corrupt and lust-filled halls of a Japanese high school, where the line between educator and student is systematically debauched. The story centers on Itsuki Miwa, a male teacher whose presence ignites uncontrollable desire among both his colleagues and pupils. The arc begins with his torrid, secret affair with fellow teacher Miyuki Kisaragi. Their passionate encounters escalate from stolen moments to brazen fucking sessions in empty classrooms and offices, where Miyuki's glasses steam up as she's bent over a desk and ruthlessly pounded from behind, her moans muffled by her own hands. Their depravity is discovered by another teacher, Sara Yasui, who, consumed by a venomous cocktail of jealousy and raw lust, decides she wants a piece of the action. Instead of exposing them, Sara blackmails Itsuki, demanding he service her cunt with the same vigor. This leads to intense, sweaty threesomes and solo sessions where Sara's insatiable appetite is explored in graphic detail. The situation further unravels with the introduction of Kurumi Sakashiro, a pink-haired student with an obsessive crush on Itsuki. She catches them in the act, leading to scenes where she is either coerced or eagerly joins in, her youthful innocence thoroughly defiled. The series climaxes in a crescendo of no-holds-barred orgies, exploring every taboo from teacher-student fucking to public humiliation, as Itsuki finds himself the central fuck-toy in a school consumed by absolute moral decay and unrestrained carnal depravity.