Riku, a well-liked handyman recognized throughout the town, faces challenges in crowded situations due to his sensitive ears. After not succeeding in his entrance exams for this reason, it was his high school friend, Sumiharu, who provided him with support. Although Riku is busy managing his own business, he finds solace in the company of Sumiharu. However, one day, during a typical phone conversation, Riku unexpectedly experiences arousal simply from hearing Sumiharu's voice. This sudden shift in his emotions leaves Riku puzzled, and he starts to observe that the physical intimacy between himself and Sumiharu is gradually growing. What implications could this have for their relationship?