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Big Eyes Small Mouth (abbreviated as BESM) is a rules-light anime role-playing game (RPG) designed by Mark C. MacKinnon and published by Guardians of Order (GoO). There are currently two different versions of the game, each built on different core mechanics. BESM d20 uses the d20 system mechanic while BESM uses Tri-Stat dX.
A third edition is currently in the playtesting stage, with the expected release currently at Summer 2005.