In April 2021, "Japan's largest e-mail friend search site" Atmeltomo suffered a data breach that was later sold on a popular hacking forum. The breach exposed 1.3M records with 580k unique email addresses along with usernames, IP addresses and unsalted MD5 password hashes.



Source: HaveIBeenpwned
Source Link: https://haveibeenpwned.com/PwnedWebsites#Atmeltomo