I Want to Eat Your Pancreas (2017)

Both movies are about a girl who has short lifespan. Both movies are very similar.....................

In both dramas the female lead is ill. And in both dramas the male protagonist accidentally finds her notebook.

Both movies star Keiko Kitagawa. Both movies are kinda similar...........................................................

Miyu and Shuya are high school students. They have dated for 2 years. Miyu and Shuya have a promise that no matter what, they will watch a movie together on the first day of each new month. When Miyu and Shuya are on their way to the movie theater, Shuya suddenly cancels their date. Shuya seems like he is hiding something and he acts nervous. Later, Miyu goes to the place where she is supposed to meet Shuya, but she witnesses Shuya getting into a car accident. She panics, but when she wakes up she finds herself on the morning of the accident. Miyu keeps waking up on the day when Shuya got into an accident.