第 1 集: Keiichi 在自己名字上寫字後，借用了會引發自愛的魔法行李箱。

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When he realizes he forgot to pack his bathing suit while rushing to meet his friends at the pool, Keiichi borrows a pair of trunks from Mion's uncle, who claims that these trunks have the magical ability to make women attracted to whoever writes their name on them and wears them for three hours. Mion hears from her uncle that he had made a mistake in describing the abilities of the trunks, and that the person whose name is written on the briefs will fall in love with the wearer, meaning Keiichi, who had written his own name on them, will fall in love with himself. The girls try to talk him into taking the trunks off. Keiichi thinks it's a trick so they can force him to wear an embarrassing pair of trunks they provided. The girls rally everyone at the pool to chase him down and retrieve the trunks by force, even going as far as turning Keiichi's only supporters (Tomitake, Oishi, and Irie) against each other to fight over wearing the trunks for themselves. Finally, the trunks are removed before time runs out. The naked Keiichi still refuses to wear the girls' embarrassing trunks. (Source: Wikipedia)