I'm trying to complete the All That Glitters Is Not Gold quest but can't for the life of me figure out how to get the scene. The gallery has it get unlocked as soon as I finish the quest, but despite trying several times I can't get the scene. Did I do something wrong earlier and just have to go redo Neruko's story from the start to get it?
To unlock that scene you need to have Neruko on Lover level at that point, so yeah there's a chance you may not have gathered enough Friendship points in her previous events.
There's one choice during that event that can get you +10 Friendship points that could get you to Lover, but yeah if you failed to get enough points in the past events then there's a chance you may not reach Lover by then.