Shusaku Ito exploits his role as superintendent of a prestigious music academy's girls' dormitory to systematically target residents from respectable families. His objective centers on gathering compromising material through blackmail, coercing the young women into humiliating sexual acts and submission. Their screams during these encounters echo through the halls, testament to his methods.

He operates without morality, employing meticulous planning within a strict 36-hour timeframe to maximize his schemes' effectiveness. Utilizing video and digital cameras to capture incriminating footage, he leverages this material to dominate and degrade his victims. Breaking their will defines his role, serving only as the beginning of his intended outcomes.

Shusaku is part of the trio known as the "saku brothers," alongside Isaku and Kisaku – comrades united by shared objectives, not blood relation. Together, they popularized the "Ugly Bastard" archetype within adult media. His visual design consistently incorporates a fly, reinforcing his grotesque persona.

His narrative incorporates a meta-fictional twist: he becomes aware of his existence as a character within an eroge and anime. This realization stems partly from interactions with Eri, the sole resident initially spared his assaults. Discovering his fictional nature leads to both a symbolic and physical demise within the story, marking a significant point in his character arc.

His legacy persists in subsequent installments like "Shuusaku: Replay" and "Shuusaku: Liberty." Eri, now aware of the fabricated reality, attempts to transcend narrative boundaries to reach viewers and players in the real world, further exploring the consequences of Shusaku's actions and the nature of his existence.