In the Spring she was 16, Takamiya Naho receives a strange, but detailed letter from herself, ten years in the future. At first she thinks the letter is a prank, but then the things written in the letter actually happen, including the new transfer student that sits next to her in class, Naruse Kakeru.
The letter reads just like her diary entries, down to the same characters. It is not till two weeks later, when Kakeru shows back up at school, that Naho finishes the letter.
In the letter, her 27-year-old self tells her 16-year-old self that her biggest regret is that Kakeru is no longer with them in the future, and asks her to watch him closely.
Review: The last one was my favorite but so sad . Kakeru is still sad over his mother he thinks it's his fault . Naho and Kakeru get in a fight and become more distant that's when Naho Confesses to him . I cried and laughed so much in this manga Kakeru has all these friends and he's in pain and he died cause he drove his bike in front of a truck but they plan to stop it Higata said they should break his bike I love him haha and he ended up doing so they find Kakeru trying to kill himself but suwa tackles him and they tell him about the letters I loved this series so much . Kakeru ends up finding his mom's phone with a message she never sent to him she divorced his father cause he was beating her and didn't want Kakeru to get hurt and she found out the people on the soccer team was bulling him . I feel in a way that message helped Kakeru I loved this series great ending .