Excuse me but I'm afraid I might have not gone to the Seal of Flesh yet. I've already done the Seal of Wind (the one on the left) but the other two are blocked by a girl saying that the content has run out. The Seal of Flesh is the one at the very begining of the game? A girl there told me I could go through if I were fat enough, but even being immobile and jumping in front of the door did nothing, so I guessed it wasn't time to be there yet :/