Arifureta Shokugyou de Sekai Saikyou: Maboroshi no Bouken to Kiseki no Kaigou

Back from the Sunken Ruins of Melusine, Hajime knows that his coming farewell with Myu is close, so he decides to give her one last adventure before the journey continues. The group talks about the Seven Great Legends of Erisen and tries following them, but the first stories lead nowhere. The seventh, however, brings them face to face with a giant creature that throws them into a mysterious ruined city.

Myu becomes separated from the group, and Hajime's search for her leads to an impossible encounter: the legendary Liberators are trapped in the same place, having arrived from another era. To return everyone to their proper time, the two groups must fight together in an adventure that briefly brings past and present into the same world.