For Japanese people, sento (public baths) are not just bathing facilities; they are local social hubs and sacred spaces for resetting mind and body. Since ancient times, they have been cherished as "yuya" (bathhouses), where people soak in the hot water after work, relieve the day's fatigue, and enjoy conversations with neighbors. Against this backdrop, "unspoken rules for everyone to have a pleasant time" naturally emerged. This is also a manifestation of Japanese culture, which values maintaining a respectful distance from others.
Upon entering a sento, you first undress in the changing room, but before heading to the bath area, it is common to bring a small towel. Many people are careful not to put the towel into the bathtub. Why? Because the bathtub is considered clean water for soaking, not for washing. At the washing area, you quietly wash your body with a small bucket, being careful not to splash hot water or soap on your neighbor. Few people speak loudly; it is considered good manners to enjoy the bath quietly.
In an actual sento, you take off your shoes at the entrance and place them in a shoe locker. In the changing room, you put your clothes in a basket and valuables in a locker. In the bath area, first thoroughly wash your body and hair at the washing stations, then quietly enter the bathtub. When leaving the bathtub, wring out your towel to prevent dripping. If there is a sauna or cold bath, it is common to lightly wipe off sweat or moisture before using. All these actions stem from consideration for other guests.
If you like, try to keep these three points in mind: 1) Always wash your body before entering the bathtub. 2) Do not put your towel in the bathtub; place it on your head or fold it and set it aside. 3) At the washing area, wash gently so that hot water and bubbles do not splash on those around you. These small considerations create a relaxing space for both you and other guests. Sento are places filled with the spirit of Japanese "omotenashi" (hospitality). Knowing the rules allows you to experience the culture more deeply.