That could have been more than one too, Manabu never clearly stated that it was a single person that did that.
Let's say for example that two or more of Yuuichi's friends actually participated in this game before (and it was heavily hinted that they have been doing this game many times in the past with different groups) then they'd have a common interest in participating again to erase their debt and dump it all onto someone else.
The game has several conditions that allow for that to happen, so there could be very well two or more conspirators working together.
Also it's entirely possible that Manabu lied and there is no original traitor, but I guess that's unlikely.
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