People dating from 18 to 39 years old in Japan for free

Aichi-ken Akita-ken Aomori Chiba-ken Ehime-ken Fukui-ken Fukuoka-ken Fukushima-ken Gifu-ken Gunma Hiroshima-ken Hokkaidō Hyōgo-ken Ibaraki-ken Ishikawa-ken Iwate-ken Kagawa-ken Kagoshima-ken Kanagawa-ken Kōchi-ken Kumamoto-ken Kyōto-fu Mie-ken Miyagi-ken Miyazaki-ken Nagano-ken Nagasaki-ken Nara-ken Niigata-ken ōita-ken Okayama-ken Okinawa-ken ōsaka-fu Saga-ken Saitama-ken Shiga-ken Shimane Shizuoka-ken Tochigi-ken Tōkyō-to Tottori-ken Toyama-ken Wakayama-ken Yamagata-ken Yamaguchi-ken Yamanashi-ken other regions from Japan