Ep. 21: Sakura's Determination

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Having realized she lost to Nemu, Sakura decides to move on, but when word of Nemu's unusual condition reaches her, she rushes to her side. A chat with Yoriko prompts Sakura to make a fateful decision. Believing the magic has become troublesome Sakura sacrifices her most important thing and withers the magical cherry blossom tree. (Source: Wikipedia)