Ep. 4: Certain Strike! The Three Little Pigs Attack

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Marin transfers to the same school as Chacha to get closer to Riiya but ends up in a different class. Yakko gives Marin a love potion which makes anyone who drinks the potion fall in love with her. Through a series of accidents, the potion is mixed in with the school lunch, causing everyone in the Banana Class to fall in love with Marin. (Source: Wikipedia)