Neptunia games are known for 4th wall breaking and otaku jokes. This is one of the best jokes I saw when Playing Neptunia's first game('s remake) few days ago.
This happens early in the game (the first dungeon). You can find the whole scene in this video that I found on youtube.
What makes it more funny, is that this game comes close to many... ecchi things but never goes to them into details... the game both targets the otaku as a main audience and jokes about otaku.
Game: Hyperdimension Neptunia Rebirth1
source: screenshots from the game, taken and grouped by me.