Hoping to generate an Olympic buzz at home and overseas, Tokyo's 2020 organizers kicked off the countdown to the games on Monday — exactly three years before the opening ceremony — by releasing the lyrics for a promotional theme song and summer dance.

But the preparations for the Tokyo Olympics are not all fun and games because delays in construction and other problems are threatening the quadrennial event.

On Monday morning, Tokyo 2020 Olympic Organizing Committee President Yoshiro Mori appeared on stage at the Toranomon Hills complex in Minato Ward to express his hopes for a successful Olympics.