1.7M accounts from Nihonomaru (nihonomaru.net) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In late 2015, the anime community known as Nihonomaru had their vBulletin forum hacked and 1.7 million accounts exposed. The compromised data included email and IP addresses, usernames and salted hashes of passwords.
Source: Have I Been Pwned (CC BY 4.0)