Ep. 1: Pure Pure Pleiades: Play 1 Overlord and Beginning

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Ainz accidentally used Total Maniac on himself and panicked after regaining his emotions. Even looking at himself scares him. As he is panicking, Albedo breaks into his room, thinking he is in trouble as he did not reply her earlier, which he then gave an excuse that he was thinking about the situation in the upper floors. As he stared at her, he accidentally commented on how beautiful Albedo really is, causing Albedo to become momentarily stunned and become excitedly love struck the next moment. (Source: Overlord Wikia)