Secret Dungeons
     You can unlock secret dungeons after you complete the main story.

Unlockable:          How to Unlock:

Girls Only Dungeon   Located behind the shrine near Himiko

No Item Dungeon      Located in Surei Town. Need Gankatsu tailsman.

Mugen Chasm          Located in the spot where Shizune ran to


Unlockable Characters
     To unlock the characters, you need to have beaten the main story.

Unlockable:          How to Unlock:

Gen-An               Complete the main story

Himiko               Talk to her in Kamairi Village

Hinagiku             Talk to her in Mugen City

Suzuri               Talk to her in Kamairi Village

Ichika               Unlock the No Item dungeon then talk to her 
                     in Surei Town