where's the gallery i cant find it, i cant find the japanese text in the main menu?
You need to reach an ending for the gallery to show up in the main menu. I think any ending works, but I don't remember for sure since it's been a while.
There's also that one save that's floating around this thread, but that one doesn't properly open the gallery, instead, it's a modified save that loads into the gallery room with everything unlocked. So you have to load that save specifically.
Note, I don't remember if that save breaks anything when used.