shoujo, romance, school life
it's about a girl who really enjoys reading, and she puts a letter in one of her favorite books.
a boy who likes her ends up with the book, and writes her a letter back.
they continue writing letters.
the boy is very rude to her up-front, but he actually really likes her.
and in the middle of them is a senpai whom the girl originally likes.

i think it was a oneshot, but I might be wrong b/c i checked shoujo school life oneshots w/ the genre search.
i feel like the title had mr. nameless or something in it.. maybe i'm wrong, not sure.

Haikei, Nanashi-sama ?

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yes, thank you!!