Season 1

Shito-san invites Kara-chan to Nagano to visit a Finnish sauna named Lamp.

After a planned visit to a burger shop is disrupted, the boys instead eat ribs while wearing kimonos, before heading to Kamakura Hotel to perform a tea ceremony and use the sauna.

Upon learning that their next destination in Kanazawa, Kara-chan asks to meet up with a local friend while they are there. Shito-san instead invites Makki, a wood carving artisan, along. The group stay at Korinkyo, and split up to use a variety of the hotel’s facilities - Shito goes to the in-room bath, Kara enjoys the in-house drinks in the bar, and Makki tries an isolation tank. Finally, they all meet up to enjoy use of the hotel’s rooftop sauna together.

After exhausting work days, Kara-chan and Shinto-san escape to Sherokuma sauna in Nagano to enjoy barbecue in the snow, and, of course, saunas.

When Shito-san admits to never having been on a roller coaster, Kara-chan takes them both to Tokyo Dome City to ride one - but when they get there, they discover the ride is closed due to rain. Instead, they try Spa LaQua’s exclusive Rentola sauna nearby, before eating chashu bao together. Eventually, the rain lets up, and they get a chance to ride the roller coaster despite Shito-san’s nerves.

Shito-san takes not only Kara-chan, but also his female friends Gurumi and Goromon to The Hive sauna in Toyama. In conversations with the others, Kara-chan learns a little more about his friend.

Kara-chan debates career options over donuts. Shito-san tells Gurumi and Goromon a little about how he met Kara-chan. Kara-chan visit’s Makki’s new Tokyo exhibition. Then, the whole crew heads to Enoshima together, eating deep-fried curry bread from Giraffa.

The crew heads to their hotel, 8HOTEL Chigasaki, which happens to be where Shito-san and Kara-chan stayed on their first trip together. The familiar surroundings bring back memories, and the two reminisce over their shared history.