Akatsuki
Original Akatsuki
Akatsuki is a villian-like organization of S-ranked missing nin. They aim is to collect all the bijuu, by killing the hosts and sealing them away.
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Akatsuki in SL
The Akatsuki play little part in SL, only appearing in Otogakure after a certain amount of Orochimaru Kills. According to how you "use" them, they may actually play a big role in the game for you.