On the anniversary of their second year together, Shiromi witnesses her ex-boyfriend Yanagi having an affair. She was dumped and she was heartbroken when she was told she was the third woman. On top of that, the worst part was that she was in the same company, even though she was in a different department, so even if she tried to avoid it, she was gradually driven into... And when she was in trouble because she was forced to reconcile with her, it was the young ace, Mr. Kaduri, who came to her aid, saying, "Because she's my girlfriend." Mr. Kadokuri, who fought off his nagging ex-boyfriend, invited me to dinner, and I followed him to a familiar park. The two of them met five years ago...!?