your ep number is the same as how many times you've used the "ADVANCE LOG" button. if you forgot, click these in order until you see where you are: EP5 has not yet released
EP0 - start until being kicked out by
EP1 - first two embassy memories (the middle two)
EP2 - bottom embassy memory, pt. 1
EP3 - bottom embassy memory, pt. 2 ("golem maintenance")
EP4 - bottom embassy memory, pt. 3 ("pale halls")
click for hints. anything from an earlier ep can be accessed in a later one
(added in ADD1) (you've probably seen already without realizing it was optional)sink deep, deep down, once more
(added in ADD1)before proceeding, return to the start
(added in ADD2)search the un-world
have you seen any words oddly highlighted? no, not the underline. you can find an important first one from either or
(added in ADD2)in the depths of a ship
(added in ADD1)backstage of the cyst, find 
to enter (or talk to your friend made through battle)
again (added in ADD1)eat away at a vessel
again (added in ADD1)take a right
again (added in ADD2)has anyone been acting weird? wanting out? try showing them one of your new tools
be very funny, then loop
go into third person in the last room and interact with akizet. if you haven't reset your iteration, just load it back up and you'll be there. this isn't a "secret" it's just poorly indicated