Sponsors are the financial backbone of sumo stables. Raijin stable's sponsor is the chairman of the board and administrator of a huge hospital, Ueda-sensei. Master Raijin, Inokawa and Tatsunokawa get invited to Ueda-sensei's daughter's wedding, but the two main wrestlers are in Hawaii on a sumo-tour. Master decides to take Matsutaro to the wedding instead, but ... what a dangerous decision for the master to make.
No, becoming the pet of Uehara 
General Hospital and eating dog food
Nein, ich werde lieber das Haustier
des Uehara Krankenhauses!
No, seré la mascota del Hospital Uehara.
No, seré la mascota del Hospital Uehara.
Não. Eu serei o cachorrinho
 do Hospital Geral Uehara.