Added: July 10, 2012
The episode opens on the Saitama Super Arena filled with members of Underside of Kitten Paw, a fanatic group obsessed with cats. Their leader, Antonia Morfenoss, shows pictures of Eris and declares her to be their new idol of worship.
When Kio wakes up, he walks in on Eris dancing and being abnormally energetic due to having smelled silver vine spirits, an Asian plant reported to be stronger than catnip. Dr. Dyureru appears and explains that Eris will soon be going into heat, causing her to have heightened senses, and congratulates Eris on having a mating partner on her first heat, much to Manami's outrage and Kio's embarrassment. She also assigns Eris a mission to go into Tokyo and "observe the human economy, technology, and culture", which, according to Eris, means to bring back a bunch of toys and games as souvenirs.
On the train back, members of Underside of Kitten Paw separate Eris and Kio from Manami and Aoi, putting them to sleep and showing the sleeping Eris live to the screaming fans of Underside of Kitten Paw.
Note: In this episode, Louise from The Familiar of Zero and Lisa, Cecily Cambell, Luke Ainsworth from The Sacred Blacksmith can be seen while they were at the Nakona Broadway shortly after the airplane scene in the anime.