For those who can't hear the song, or can't recognize it from what they hear, would someone post which song it is in the tns?
It's linked in Graf's first bubble in the third panel.
I think the full details were given the last time this song appeared.
It's a good bath~♫It's a good bath♪Babanba banbanbaan⤵Ahahan♩...HmBabanba banbanbaan⤴So no one's here. Must mean it's currently reserved then. ※GrafMmUooooh!?Fuu~