The Dark History Of The Reincarnated Villainess manga volume 6 features story and art by Touka Akiharu.

In order to stop an assassination plot targeting her dear Konoha, Iana takes off with Yomi for...the land of ninjas. However, someone attacked the ninjas and made off with their list of clients! Since Iana's name was on it, it'd be disastrous if it went public. The culprit is an old friend of Sol’s--the assassin Ognis. Will old friendship with the assassin or loyalty to his new mistress win out in Sol’s heart?