Whilst the Jūden-chan relax at an onsen, Plug gets annoyed at people comparing her breasts to Arrester's, causing her to turn crazy and start molesting everyone.

In a cosplay show for the male customers, Arrester dresses up as Milly and ends up getting attacked by an octopus controlled by Plug. However, the controls soon short out, and the octopus attacks her and the other cosplayers as well.

After being charged by a new refresher, Iono and Hakone start coming onto Sento, so Rona uses her powers to remove the effect.

Plug, Arrester and Rona catch Reika and Kuran eloping in the springs. However, it turns out to be a holographic projection and the three peepers are punished by the real Roden-chan.

Plug and Arrester duke it out in a nude fight. However, Arrester gets the upper hand when she exploits Plug's weakness, her antennaes, and temporarily becomes a sadist.

As the Juden-chan celebrate their final night at the hot springs, someone adds an anti-stealth potion that lets them be seen by normal humans.

An OVA bundled with a limited edition of one of the 10 and final volumes of Fight Ippatsu! Juuden-chan!! the manga.