"boukyou" can mean nostalgia.
"Iwaku" can mean "past", or "history".
As in 'see you later?' You may say 'jaa, [mata] ne.'
Japanese would say sashiburi
I think you say it like mitete. My experience is from naruto ( sasuke's and itachi's past)
saw. Today, I see a tree. Yesterday, I saw a tree.
Yurei wo Miteita!
see Google Translate
Miru koto wa dekimasen
You may say 'Eiko ni aitai.'
ja ne mata ne
urigami nakoruto hertforumenas
'Itsuka mata aimasu ka?'.