Japanese song about pooping in a bathtub

Drew Daniel over at Pitchfork media has this review of Bathtub Shitter's song "Brown Santa":

I know you're already thinking, "That Japanese scatological metal band made a Christmas record? Awesome!" But wait-- it gets better-- because it's got an a capella track on it. On previous outings Bathtub Shitter teased us by leaving a little clump of Masato Morimoto's abject, preposterous growling and yelping vocals to stick out at the tail end of their songs here and there, but now they've offered up a whole minute of him serenading without any bandmate backup. Naked, shivering, and alone. A handy lyric sheet is provided so that you and your neighbors can carol along with Masato as he asks an important question about the titular Brown Santa: "Would you receive his present?" Chew on that one.

Only 2.5 stars. I haven't heard the song, but my tastes for Japanese metal are vast enough to listen to everything.

I can't find this band on amazon or allmusic so maybe they don't really exist.