Yuna tells Stitch the story of Captain Khan, so Stitch decides to find the pirate and his ship. However. Yuna, Stitch, and Kijimunaa run into a group of young pirates who are looking for the ship as well, so Stitch decides to tag along with them.

Hämsterviel re-corrupts some experiments using a recording of Angel's siren song and causes them to do chaos again, disrupting a class project at Yuna's school to build a playground for an upcoming festival. Link binds Yuna and Penny together, and Babyfier transforms everybody else (apart from Stitch) into tiny babies. While Stitch takes care of the babies, Yuna and Penny must try and co-operate together to find the antidote to get everyone back to normal.