Aharen-san wa Hakarenai revolves around Reina Aharen, a sweet but spatially challenged student with a soft voice. Her tendency to invade personal space unknowingly puzzles those around her. Amidst this, Raidou Matsuboshi, with a stern appearance masking a gentle nature and vivid imagination, sits beside her in class. Their peculiar friendship takes root when Raidou simply retrieves Aharen's eraser for her. However, this small act of kindness leads Aharen to mistakenly believe they are now best friends, showcasing the intricate complexities that arise from seemingly mundane interactions between them.