Armored Core: Project Phantasma

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The Raven (protagonist) receives an unusual request. The cryptic message tells the player to infiltrate a mysterious underground complex called Amber Crown with a promise of an extremely lucrative monetary reward. Once in Amber Crown, the player encounters Sumika Juutilainen, an escapee from the enigmatic Doomsday Organization (Wednesday Organization in Japan), the shadow group that has been operating in the complex. Sumika becomes the player's primary client and partner during the mission in Amber Crown.