Goda is a science professor at Siren Academy, a prestigious girls' boarding school. During a storm, he unearths and shatters a mysterious stone tablet beneath a large tree in the schoolyard, leading to his attack and infection by a large tentacled monster. This infection results in his possession by the organism.

Following his transformation, Goda collaborates with the Director in the school's underground church basement. There, they rape a bound and gagged freshman student. The Director actively participates, wearing bondage gear and whipping the victim. Goda explicitly states his need for "extracts of younger women" to sustain the organism he discovered. His infected state manifests through visibly sinister behavior, such as malevolently eyeing new students during orientation ceremonies.

Goda's influence extends beyond direct assaults. The student population exhibits listlessness and disinterest, potentially linked to his activities or the organism's presence. While Yuko Yoshikawa's violin playing briefly energizes the students, their apathy persists. Goda monitors these developments from the church, where he experiences an attack by a fairy-like entity named Rom. This encounter does not alter his course.

His actions drive narrative conflict, particularly concerning students Atsuko Yoshikawa and Sayaka Matsumoto. Their romantic relationship and Atsuko's popularity disrupt the subdued environment Goda oversees. However, his character lacks significant evolution or redemption arcs. The organism's control remains dominant, and Goda consistently functions as an antagonistic force focused on harvesting biological material from the students.