Secret Unrequited Love (2019)

Mayu and Takuma are childhood friends. At age 8, they learn that Takuma will die from terminal illness before he turns 20. Despite knowing this, the two grow older and fall in love. Mayu stays loyal to Takuma even as he tries to push her away. Suddenly, new people enter into their lives, and Mayu and Takuma begin to question their feelings for each other.