The protagonist and narrator, referred to as "Boku" (meaning "I" in Japanese), is a young student witnessing the relentless bullying of his classmate Don by Yaragase and his group. This harassment begins after Don accidentally sneezes on Yaragase.

Boku consciously adopts a passive stance, practicing "shiranpuri" (minding his own business) to avoid becoming the next target. Yet, observing Don's suffering triggers intense internal conflict, marked by guilt, fear, and a sense of powerlessness. The narrative centers exclusively on Boku's perspective, charting his psychological journey from bystander to moral reckoning.

He undergoes significant internal growth, repeatedly questioning the ethics of his inaction and concluding that silence is wrong. This shift culminates in his resolved determination to speak out against the bullying; his specific future actions remain undetailed.

Visually, Boku and others appear in a distinctive crayon-like, childlike art style, reinforcing the school setting and his youthful perspective. Little specific information exists about his personal background or life beyond the classroom, as the narrative focuses on his observer role and moral dilemma.

His entire development occurs within a single 24-minute film, with no additional appearances or expanded backstory in other media. His story concludes with this transformation from complicit silence to intended intervention, leaving his actions open-ended.