This is the story of how I stole my best friend Nagi's boyfriend. Although Nagi was dating Taichi, she had become obsessed with another man. I had always loved Taichi but stepped aside for my friend; then I saw how lonely he looked and blurted out that he should leave her and date me instead. When I heard Nagi planned to travel with her senior a month later, I gave her until then to repair the relationship and promised myself I would back off if they reconciled. But Nagi left Taichi behind and went on the trip, so I decided to take all of him—his heart and his body.