Women wearing traditional happi coats perform a drum on board a float as it is paraded during an annual Sanja Festival at Tokyo's Asakusa shopping district Sunday, May 17, 2015. Japan's Sanja Festival is one of three big festivals in Tokyo and is held on the third weekend of May. (Photo by Shizuo Kambayashi/AP Photo)

A reveller sleeps on the pavement during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. The Sanja Matsuri festival attracts over about one million visitors over its duration of three days, when parties of revellers carry portable shrines through the Asakusa neighbourhood, rocking and shaking them in a belief that this intensified the powers of the deities that reside inside them. (Photo by Thomas Peter/Reuters)

Revellers scuffle over the control of a portable shrine, a Mikoshi, during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Revellers carry a portable shrine, a Mikoshi, through a narrow street during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Revellers charge down a street to take control over a portable shrine, a Mikoshi, from another club during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

A man shows his traditional full body tattoo as he poses outside the Sensoji temple during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Revellers and police watch a portable shrine paraded through a street during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

A man wearing a Shinto dress rides a horse during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Revellers stand in front of an election poster showing Japanese Prime Minister Shinzo Abe (back L) as they watch a portable shrine paraded through a street during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Revellers wear traditional short coats as they watch a portable shrine paraded through a street during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Revellers carry a portable shrine, a Mikoshi, through a narrow street during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Men wearing Shinto robes lead a procession of portable shrines during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

A woman holds a smouldering incense stick as she prays outside the Sensoji temple during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Men show their traditional full body tattoos as they pose outside the Sensoji temple during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Revellers carry a portable shrine through a narrow row of market stalls outside the Sensoji temple during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Men wearing Shinto dresses wait for the arrival of a portable shrine during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Revellers carry a portable shrine through a narrow row of market stalls outside the Sensoji temple during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

A man prepares a portable shrine for its parade during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)

Revellers wear traditional short coats as they wait for the arrival of a portable shrine during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. (Photo by Thomas Peter/Reuters)