Read as "ichi-haya-ku" (the digits spell いちはやく — "quickly"). Calls are routed to the nearest Child Guidance Center (jido soudansho) based on the caller's location. Anonymous calls are accepted and confidentiality is protected. Toll-free since 2019-12-03. Operated by the Children and Families Agency (transferred from MHLW in 2023). TELL Japan, a well-respected NPO has an explanation page in English: https://telljp.com/resources/child-abuse/