Kagura has gotten fat because of her recent degenerate lifestyle. She goes to Otae for advice, but Otae has also gotten fat from eating too much ice cream. Satchan laughs at the both of them for becoming fat, but she has also gotten fat… The three spurred to do something about their situation. They join a famous fasting dojo in town. There they run into Otose, Catherine, and even Kyubei…
[Note: A kotatsu is a low, wooden table covered by a heavy blanket with a built-in heater. Used mostly in Japan.]
Te duermes bajo el kotatsu, duermes con 
el vientre al descubierto y no haces nada.
Você dorme debaixo do kotatsu 
com a barriga exposta