Ep. 20: A Time of Shock! True Identities Revealed to One Another

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Minako becomes upset that a Daimon had not attacked her, and she feels that she does not have a pure heart . While she strives to prove she is pure she ends up being attacked and her pure heart is taken from her. The Outer Senshi and Guardian Senshi learn each others identities. (Source: Sailor Moon Wikia)