The 4th weapon
Beat any star stage in chaos mode or beat 3 stars or above in hard mode.
The 4th weapon - beat chaos mode or beat 3 stars or above in hard mode
Unlock 3rd costumes
Unlock other costumes for characters. They are usually older costumes as used in previous games.
Unlock 3rd costume - Raise character proficiency to 10
Read how to unlock.
Shin Orochi - Complete Dramatic Mode