Kaito Takahashi, a member of the popular Japanese band KING & PRINCE (commonly known as Kinpuri), has been reported to practice everyday underwater submersion in a bathtub. Takahashi's unique relaxation routine, aimed at attaining mental tranquility, has attracted public attention and garnered significant media interest in Japan. The ritual also reflects a broader trend of celebrities revealing their personal wellness habits to fans.

In Japan, the daily lives and routines of celebrities often gain considerable interest among the public. The emphasis on mindfulness and tranquility in everyday life is also deeply rooted in Japanese culture. Personal wellness habits, especially those of popular figures like Takahashi, often influence societal trends and consumer behavior.

In the US or EU, there's also significant public interest in the personal lives and routines of celebrities. However, the emphasis may be more on extravagant or eccentric lifestyle choices, rather than on tranquility and wellness as in Japan.