The first person she fell in love with was her best friend's boyfriend. Reina, her best friend Rio, her boyfriend Hajime, and their male friend Daichi were a close group of four at university. During a two-day, one-night camping trip, the four of them find out that "in fact, Rio likes Daichi." Reina, who has been interested in Hajime, begins to waver... and ends up having a relationship with Rio's boyfriend, Hajime... This is the first collaboration between the masters of youth dramas, Asagiri Jyo and Miyauchi Reina! A full-fledged pure love drama depicting the heart-wrenching love between men and women.