The series follows a young, aspiring doctor during his intense hospital internship. His 'training' quickly devolves into a series of debaucherous sexual encounters with the hospital's voluptuous and sexually aggressive nursing staff. The narrative arc centers on his complete submission to their carnal demands. From the stern head nurse who uses her authority to force him into explicit acts in her office, to the playful younger nurses who gang up on him in empty patient rooms for relentless group sessions, each episode explores a new depraved scenario. He's subjected to intense oral servicing, deep anal explorations, and is often used as a sexual plaything for their pleasure. The '研修日誌' (Training Diary) of the title becomes a log of his sexual subjugation, detailing every orifice they conquer and every drop of semen they milk from his constantly erect cock. The series climaxes with him fully embracing his role as the hospital's cum dump, eagerly servicing the entire female staff in a massive, sweat-drenched orgy.