Crimson Sea 2

Playstation 2

Get the Fashion Ring:
Beat Crimson Sea, then go and check the VendorBot in IAG.

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Get an S-Rank in the following missions to get the multiplayer only unlockable characters:

Original Menace	Bow Rahn
Princess Shami	Shami
Diez Woman Warrior	Diez

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Get all S-Ranks in the following missions in ONE SHOT to get the items:

A Town in Panic	B Ability
Operation Network	Fashion Ring
Crimson Sea	Replicator
Rescue Daisy	NP Booster 2
Deadly Energy	HP Booster 2
Soul of Semplice	Reserve 2
Fiery Seguido Base	NP Convertor 2
The Menace Hordes	Surge 2
The Prototype	Surge 1
Remnants of Times Past	NP Ability
Prestsite in Darkness	Trainer 1
Valley Stalker	Trainer 2
Poisoned Una	NP Convertor 1
Lab at Movindo	Vipa Suit 2
The Crafty Menace	Vitalizer 1
Battle of the Minefield	Vitalizer 2
A New Menace	Siphon 2
The Stolen IAG Badge	Siphon 1

Thanks to Revolution readers legion, g-clef, Jonah981 and Underhill!