Police in Tokyo said they took 13 teenage girls into custody in Akihabara for "JK osanpo" (JK walking) this week. "JK osanpo" is a coined expression derived from “joshi-kosei” (high school girls) and "sanpo" (walking), and is the latest variation of "enjo kosai" (compensated dating).

Police said Akihabara has rapidly expanded as a hotbed for various types of sex crimes involving underage girls, TBS reported Wednesday. The 13 girls detained on Tuesday are aged 15 to 17; 11 of them attend school while the other two are runaways, police said. Some of them were wearing their school uniforms.

The girls solicit male passersby by offering to go for a walk with them or go to a cafe. The going rate is 5,000 yen for 30 minutes. Police said the girls told them that in some cases, they had been offered more money by men to go to love hotels, provide their underwear or let their "customers" take upskirt photos, TBS reported.

Police said their investigation has turned up 96 establishments in Akihabara acting as bases for "JK walkers."

A police spokesman said many of the girls taken into custody said they didn't think they were doing anything wrong and that their parents were unaware of what the girls were doing.

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