Ep. 1: Sketching Event! Dokuro-chan! / Bubbles and Scrubbing Battle! Dokuro-chan!

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Sakura, Dokuro and Shizuki are on a school trip where they are asked to draw the scenery, but not without Dokuro harassing him most of the time. After Dokuro and Zakuro are scared of a "monster" they read about in a myth book, they then want (and force) Sakura to join them in the bath. (Source: Wikipedia)