Nanatsu no Ko
is a popular Japanese children's song with lyrics written by Ujō Noguchi and composed by Nagayo Motoori. Published in Kin no fune magazine in July 1921. Nanatsu no ko is used as the departure melody at Isohara Station in Kitaibaraki and also as 6 p.m bell in Japan Advanced Institute of Science and Technology at Nomi, Ishikawa.Lyrics
In the manga and anime Detective Conan by Gosho Aoyama, the mail address of the boss of the Black Organization is #969#6261, which reproduces the beginning of Nanatsu no Ko.
