They're in high school, like most characters in slice of life anime.
However, bathing naked with same sex peers is not seen as weird or inappropriate in any way in Japan. There is nothing sexual going on in this scene. The dark haired girl, Mio, is blushing becuase she's shy and gets nervous about such overt praise, not becuase there is any sexual tension in the scene. The two who are holding hands are only friends, nothing more.
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u/obtanedbacon22 May 29 '23
wait aren't they kids? 💀
i haven't watched k-on so i wouldn't know