That's an extraordinarily large techincality (I don't think that's the correct word to use here), Soriku. So much so, I'd say that it could be ANY game.
Just because SE has a habit of announcing games and releasing them years later doesn't mean they always do that.
Kimi wa ne tashika ni ano toki watashi no soba ni ita
Itsudatte itsudatte itsudatte
Sugu yoko de waratteita
Nakushitemo torimodosu kimi wo
I will never leave you