the grandson of the legendary bath scrubber (played by masahiro hokuno) is a normal sunny boy on the surface, but he has a magical tongue that has an "absolute tongue feeling" and can easily distinguish the components of matter. aaa。 however, his tongue did not bring much good luck to his love, because he couldn't help but analyze the ingredients in the other person's mouth during kissing. until the day his grandfather passed away, the mysterious hot spring geisha made him taste the taste of love for the first time. after that, in order to find the uncertain whereabouts of ya, he and the nagging complaining expert kiyoji miyazawa (played by jiro sato) and an antique businessman who loves to pretend to be a police officer in a two-hour criminal investigation drama.urnthe coffin tomb light (played by kimura fumino) embarks on a long hot spring journey. in various hot spring resorts, ranmaru lost again and again, and was involved in mysterious and bizarre murder cases again and again...