The box Of 100 Letters.....

A guy name Jin goest to Highschool. In his first year there...he only meets two of his friends from Middle School...he then also meets two girls
that year; Siren(sai-ren) and Yume(Rhymes with June).....Siren starts to develop feelings for him and then tells him , he having no feelings for her but don't wanna hurt her either way, goes
with her.....on the other hand..Yume haves feelings for him but he doesn't know...at the end
Jin is left with A box with 100 letters from Yume.