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Daichi Tamari, an unassuming high schooler, feels invisible in his everyday life, mocked as "Harmless-kun" by his classmates. His only escape is the anonymous world of social media, where he thrives as "Toxic-kun," sharing his true passions with a supportive online community. Everything changes when he connects with "Kusomiso Man," a kindred spirit who shares his struggles. As their online friendship deepens, Daichi begins to blur the lines between his virtual and real worlds, navigating the challenges of identity, connection, and unexpected revelations.