Ok so this story is a hidden gem stone. If you’re into like romantic, tragedy stuff than this will suit you. It’s about a 16 year old girl named Naho Takayima who is a second-year high school student who finds a letter that her 10-year future self wrote to herself. In that letter, 26 year old Naho writes about her biggest regret she faces and tells Naho to prevent a tragedy from happening. She will meet a transfer student named Kakeru Naruse and her future self writes about events that will happen and what she wants 16 year old Naho what not and what to do. Future Naho wants her 10-year ago self to prevent Kakeru from committing suicide as that was her biggest regret and it is up to Naho and her friends to prevent it from happening.