The yellow underwear hung out to dry in the courtyard... that was the sign they were open for business. A home spa tucked away in a residential neighborhood with no sign outside. The guy stepped in out of curiosity and before he knew it, he was a regular. But one day, waiting for him there was his wife's best friend. 'Hey? Haven't we met somewhere before?' 」A secret that shouldn't be known slowly eats away at everyday life──
