Collect the following items to open up a new section in the extra contents

Unlockable	How to Unlock
CG Collection	Obtain the Album in Chapter 1
Chapter 8	Obtain the Key to Hell in Chapter 5
Face Collection	Obtain the Magic Mirror in Chapter 6
High Score	Obtain the Valdes Scripture in Chapter 4
Item Manual	Get the Item Manual from Claude after Chapter 2 and giving him the correct code
Sound Test	Obtain the Music Sheet in Chapter 4
Voice Collection	Obtain the Spiral Shell from Reiche after Chapter 3 and giving him 3 unidentified mushrooms