VOICE:
https://aivoice.jp/character/kotonoha/
https://aivoice.jp/product/kotonohaeng_ja/ (English ver.)
character picture:
blueberry san(https://seiga.nicovideo.jp/seiga/im5985123)
OSM:
http://www.openstreetmap.org/copyright
Twitter:
http://twitter.com/japanroute43
niconico:
http://www.nicovideo.jp/user/92164945
niconico-channel:
https://ch.nicovideo.jp/nikkohken