Genre: Drama , Romance
Takuma Kakinouchi (Masaki Okada) and Mayu Taneda (Mao Inoue) were friends since 8-years-old as Takuma has a heart disease and he is treated by a cardiologist who happens to be Mayu's father (Toru Nakamura). The friendship grows and Takuma becomes Mayu's first love. He promises to marry Mayu when they turn 20. One day, Mayu learns that Takuma would not live past the age of 20 due to his condition. Later, Takuma also knows about his own fate and decides to distance himself from Mayu, knowing that he cannot keep his childhood promise. Then one female patient, Teru Uehara (Natsuki Harada) who suffers a similar illness, has a crush on him. Meanwhile, Mayu finds new love with Subaru Suzuya (Yoshihiko Hosoda). What will happen to their first love? Will they unite once again and get married before he passes away?