This is a bonus episode. It exists because someone at the studio decided fans who bought all six volumes deserved fanservice in a hot spring, no apologies. The show stops pretending to have a plot and just lets its cast be stupid and comfortable with each other, which is exactly what Dog Days'' fans showed up for.
Sink, the human hero from another world, finally gets a break from constant battles and political intrigue. He heads to Limone Resort's hot spring with his closest companions, expecting a peaceful getaway filled with relaxation and hot water. Instead, what should be a simple vacation turns into comedy chaos when his friends can't resist their usual antics, and the resort's remote mountain location proves far less serene than advertised. Surrounded by characters he's grown to trust, Sink discovers that downtime in this fantasy world comes with its own brand of complications. Between playful rivalries, unexpected guests, and the general mayhem that follows whenever his group gathers, genuine rest remains frustratingly out of reach. The episode balances slice-of-life warmth with the kind of lighthearted humor that keeps the franchise's community invested. Perfect for viewers who've already journeyed through the main series and want one more excuse to spend time with these characters in a lower-stakes setting that prioritizes fun over saving kingdoms.