Nakata recalls the first time he truly relaxed in a sauna three years earlier when he copied the unique rituals of a mysterious patron.

While talking with his fellow bathing enthusiasts, Nakata describes his visit to a sauna with a swimmable cold water bath in downtown Kinshicho.

At Mr. Coincidence's recommendation, Nakata visits a bathhouse in Suginami. After finishing bathing, he is overwhelmed with a sense of nostalgia.

Nakata discusses the art of fanning the sauna heat with his friends and recounts his encounter with a legendary expert, Elegant Watarai.

In a tent sauna in Hiratsuka, Nakata learns of a new way to experience his hobby by observing a particularly tough-looking customer.

After learning about a so-called sauna sanctuary in Shizuoka, Nakata travels there to experience the holy water of its cold bath for himself.

Mr. Coincidence shares his tale of a man known as the godfather of the sauna world, which inspires Nakata to visit the man's sauna in Nagoya.

A young woman searches for good saunas on the weekends. One day, she takes the train to Nagoya and finds a distinctive facility designed for women.

Nakata visits a hotel with a sauna at Mr. Handsome Steam's suggestion. As he indulges in the luxurious atmosphere, he has a coincidental encounter.

An office worker visits the sauna in search of a cure for his loneliness. However, he struggles to keep his negative thoughts in check.

Worried that he can no longer relax in saunas, Nakata travels to Kumamoto in search of the elusive Steam Z, hoping that he will be able to help.

As relaxation continues to elude him, Nakata considers giving up on saunas. Later, he finds what he is looking for in the unlikeliest of places.

Nakata resumes his sauna trips after getting used to a new normal. He visits a facility he had previously avoided due to its sports affiliation.

Nakata tries to relieve his work frustrations by relaxing in a Kinshicho bathhouse, but he struggles to drown out the voices of the other patrons.

Hoping to stop his childhood friend from moving back to their hometown, Mr. Handsome Steam challenges him to a test of endurance in a tent sauna.

After seeing his younger colleague struggle, office worker Mr. Helper invites him to go to the sauna together and offers him some advice.

While visiting his mother in his hometown, Nakata finds his late father's old notebook. Inside, he discovers his father's past passion for saunas.

Following the sketches in his father's notebook, Nakata visits a bathhouse in Kyoto. He reminisces about his father while steaming in the sauna.

Before heading home, Nakata visits a facility in Kobe that features a palatial Turkish steam bath, a salt sauna, a waterfall shower and more.

While taking a break in Sauna Hokuo, Murata panics when his colleague appears. He tries to avoid being noticed with help from Nakata and the others.

Keeping his after-work activity secret from his wife, truck driver Adachi often goes alone to a love hotel room that contains a private sauna.

Mr. Coincidence goes on a long-awaited sauna trip with his daughter, but their contrasting levels of excitement begin to sour the atmosphere.

On the day the group is set to go on its first trip together, Mr. Coincidence and Mr. Handsome Steam are forced to quarantine. Nakata departs alone.

Nakata explores the utopian sauna of Mifuneyama Rakuen Hotel, experiencing everything it has to offer. There, he encounters a familiar face.