Thousands of revelers dressed up in wild costumes and wearing makeup swarmed Hachiko Square in front of Tokyo's JR Shibuya Station on Saturday evening to celebrate Halloween.
The Tokyo Metropolitan Police Department mobilized hundreds of riot police for the event this year.
Last year, two people were arrested. One was detained for punching a police officer while the other was taken into custody for molesting a woman.
Earlier in the day, singer Kyary Pamyu Pamyu called on partygoers in the capital to keep the streets clean as a large quantity of litter was expected to result from the gathering.
"I want everyone to help keep the streets clean, using these bags (provided by the city)," the singer said in front of Tokyo Tower in Minato Ward.
The event was organized by the Tokyo Metropolitan Government to raise awareness by handing out orange jack-o'-lantern-themed garbage bags.
"When you have fun, there will be lots of garbage," the singer said. "I want to see people in the streets fill the bags in a kawaii (cute) way."
The event formed part of a campaign dubbed "Halloween & Tokyo," under the slogan of "cleanest Halloween in the world."
The bags were handed out near stations and large road crossings in busy districts such as Shibuya, Shinjuku and Roppongi.
During last year's boisterous Halloween celebrations, a large quantity of litter, such as drink cans, were thrown on the ground by revelers, prompting the metropolitan government to launch this year's campaign.
Photo gallery of Halloween Eve on the Shibuya scramble.
