Nyaruko, Cthuko, and Hasuta head to a hot-spring bathhouse with newcomer Tamao Kurei in this OVA bundled with the second season's home-video release. Their rivalry over Mahiro Yasaka follows them into the baths, where steam, towels, and jealous outbursts turn a relaxing trip into another comedic showdown. As a bonus episode rather than new-season content, it leans on running gags from Haiyore! Nyaruko-san W's established cast dynamics.