Whether you’re seeking a quiet, snow-draped soak near Mount Fuji or a calming dip in the Japanese countryside, these onsen resorts provide a tranquil escape from the busy city life. Dive into our list of 12 must-try onsens spanning from the Kanto and Kansai regions to Kyūshū , and discover the ideal hot springs to immerse yourself in. 

If you are a big fan of demon slayer, you would have definitely seen Muzan Kibutsuji’s "Infinity Castle" in the demon-slayer series. A hot spring resort in Japan, Ashinomaki Onsen Ookawas, located in Aizuwakamatsu of Fukushima Prefecture has an interior that looks similar to the “Infinity Castle”. As you enter the lobby, get greeted by a uniquely shaped staircase that resembles a scene from the demon-slayer series where Muzan Kibutsuji, the main antagonist of the Demon Slayer, appears in a complex castle (also known as the "Infinity Castle") designed with labyrinth-like staircases and walls.