Nanatsu no Ko

lit. Seven children, or Seven baby crows, The crow's seven chicks (七つの子)  is a popular Japanese children's song with lyrics written by Ujō Noguchi (野口雨情 Noguchi Ujō) and composed by Nagayo Motoori (本居 長世 Motoori Nagayo). Published in Kin no fune (The golden ship) 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. Nanatsu no ko is the famous song in Japan.

In popular culture
The song is sung by a nondiegetic children's choir in the 1954 Kinoshita Keisuke film Twenty-Four Eyes.

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.

Is sung in the anime Magical Girl Ore episode 10 by Mohiro to console a lost child.