there's a series about their relationship growing, if you finished the movie you can read 'Sotsu Gyo Sei' this is where they've graduated, 'Sora and Hara' (spin off), 'O.B.' (LDR), and 'Blanc', I think the marriage part is here, Futarigurashi is where they r living together. I found some of them here so maybe you can read them here.
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