Erina Hirota bumps into her ex-boyfriend, Kaito Takishima unaware that he is the CEO of Hatibeo Cancer and Research Centre. Realizing that he misses his girlfriend, Kaito tries to make up for the misunderstanding he made when he left Erina to study abroad. He does everything in his power to make Erina his again. All that is left is her accepting him. Will Erina forgive him and let him enter her life again?