TOKYO — The bad boy of sumo returned to Japan, vowing to clean up his act and restore his image.

After a two-month stay in his native Mongolia, Asashoryu held a news conference in Tokyo yesterday to apologize for a series of transgressions that sullied the image of Japan's ancient sport.

In July, he was slapped with a two-tournament ban and a pay cut for playing a charity soccer match in Ulan Bator after skipping an exhibition sumo tournament in Japan. He claimed he was injured.

"I sincerely apologize for having created a great disturbance to everyone for such a long time," Asashoryu said. "I will deliver a total effort from now on, and I hope to have your support."

Asashoryu, a winner of 21 tournament titles, holds the highest rank in the ancient sport.

Like all wrestlers, grand champions are expected to adhere to sumo traditions and avoid controversy. He received one of the harsher punishments given to a grand champion.

Asashoryu is expected to take part in a regional tour beginning tomorrow, and the next major tournament starts in January.

Asashoryu withdrew after his suspension and was diagnosed with a stress disorder. He returned to Mongolia to seek treatment and recover from injuries.

"Being back in my hometown was good medicine for my soul," the 27-year-old said.

"Everybody was looking forward to seeing me in the exhibition, but I didn't live up to my responsibilities as grand champion," he added. "I want to start afresh to make up for what I lack in character and cultivate myself further."

Most Japanese felt the punishment fit the crime but some speculated Asashoryu got harsher treatment because he's not Japanese.

In December of 2000, maegashira Toki, who is Japanese, hit and killed a pedestrian while driving in Osaka. He was suspended for only one tournament.

Expectations, both in and out of the ring, are high for grand champions. They are expected to set an even higher example of humility and devotion to the sport.

Sumo currently has only two grand champions. The other, Hakuho, is also from Mongolia.