Former sumo champion Konishiki arrived back in Japan on Friday after spending roughly a year in Hawaii, watching his health while building a career as a music producer. In February, he underwent gastric bypass surgery to treat his obesity, and it has now been revealed that he has reduced his weight by about 70 kilograms.

During his sumo days, Konishiki's weight reached a peak of 284kg in 1995. After he retired and went into entertainment, his weight rose to about 300kg. He took a break from show business and left for Hawaii in late 2006, reportedly to take better care of his health. Three months after his operation, he now weighs 230kg.

Konishiki will mark his return to Japan with a live appearance on the FM Yokohama radio show "KONY ISLAND" on June 1.