Upon entering high school, Furuya was assigned to room with the charming Himi. Despite his boisterous nature, Himi tends to keep to himself and retires early. However, due to a childhood tremor, he is plagued by a fear of darkness. Contrarily, Furuya is exceedingly anxious in brightly-lit spaces and is prone to unease. How might they assist each other in conquering their respective phobias?