青線区域 (あおせんくいき) — area around a red-light district where illegal prostitution occurred (marked on police maps by a blue line; 1940s-1956)
青線区域
あ お せ ん く い き
青線区域 (あおせんくいき) — area around a red-light district where illegal prostitution occurred (marked on police maps by a blue line; 1940s-1956)