855K accounts from Manga Traders (mangatraders.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswords
In June 2014, the Manga trading website Mangatraders.com had the usernames and passwords of over 900k users leaked on the internet (approximately 855k of the emails were unique). The passwords were weakly hashed with a single iteration of MD5 leaving them vulnerable to being easily cracked.
Source: Have I Been Pwned (CC BY 4.0)