Ep. 1: Super Doctor K-Ko and Hongo trap Pachira, Liru, and Aiko while Uma rescues them and builds a mailbox.

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In the first segment, Super Doctor K-Ko and Hongo create traps that accidentally ensnare Pachira, Liru, and Aiko, requiring Uma to intervene and save them. In the second segment, Uma learns about postal services and, with Aiko's assistance, constructs a mailbox so the girls can receive letters. The narrative then follows their efforts to persuade the mailman on their specific route to deliver mail to their new mailbox, highlighting their attempts to establish a reliable communication method within their community.