Their site says the following!
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Q. I have a small tattoo...
A. When you're spending time in the building outside of bathing, it's fine as long as it can be covered by the loungewear (above-the-knee, short-sleeved yukata type).
However, if it is meant to show off ties to antisocial forces, or if our staff judge it to be intimidating, we will ask you to refrain from using our facility.
Their site says the following! --- Q. I have a small tattoo... A. When you're spending time in the building outside of bathing, it's fine as long as it can be covered by the loungewear (above-the-knee, short-sleeved yukata type). However, if it is meant to show off ties to antisocial forces, or if our staff judge it to be intimidating, we will ask you to refrain from using our facility.