Formal — to staff
Onsen · Sento
You
このお風呂は一人用ですか？それとも、他の方も入れますか？
このおふろはひとりようですか？それとも、ほかのかたもはいれますか？
Is this bath for one person? Or can others also enter?
Romaji: Kono ofuro wa hitori-yō desu ka? Sore tomo, hoka no kata mo hairemasu ka? / Reply Romaji: Achira wa tsuboyu de, o-hitori-sama zutsu go-riyō itadakemasu.
Reply
あちらは壺湯で、お一人様ずつご利用いただけます。
あちらはつぼゆで、おひとりさまずつごりよういただけます。
That is a pot bath (tsuboyu), and it can be used by one person at a time.
Gesture & etiquette
Pointing gently towards the specific bath in question.
Do not enter a bath without washing your body thoroughly first. Do not splash water excessively.
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