Modern setting. The premise is that MC is a teacher who's pretty passionless ever since his sickly childhood friend kicked the bucket in high school. One important detail is that he snuck his ill childhood friend into his high school (where he works at later), and his childhood friend left MC a letter in one of the library books. A student at MC's school finds the letter, and after the student graduates, he does this whole goofy scheme of mysteriously referencing details only the childhood friend would've known about MC (thanks to finding the letter) annnnd I think there was a bit about a greenhouse (that was decorated according to one of the letters)? For other miscellaneous details, MC had dark hair iirc, love interest and dead childhood friend were both blond.
Modern setting. The premise is that MC is a teacher who's pretty passionless ever since his sickly childhood friend kicked the bucket in high school. One important detail is that he snuck his ill childhood friend into his high school (where he works at later), and his childhood friend left MC a letter in one of the library books. A student at MC's school finds the letter, and after the student graduates, he does this whole goofy scheme of mysteriously referencing details only the childhood friend would've known about MC (thanks to finding the letter) annnnd I think there was a bit about a greenhouse (that was decorated according to one of the letters)? For other miscellaneous details, MC had dark hair iirc, love interest and dead childhood friend were both blond.
Thanks in advance!