Asta is gravely injured in the battle against Mars and collapses. Despite his own injuries, something drives Mars onward, and he tries to finish off Asta.

Many years have passed. The surviving ninjas are in hiding, and Hachirou has disappeared. The Joujinshuu have yet to return, but can these days of relative peace last forever?

Although Stella's Elder, Hofs, disagreed to share the secret of Reversion, Lance hasn't given up. He tag-teams with Ana to figure out where the secret is hidden. However, with that and his painful memory from the past, Devi's more than worried for him.

Sayo Samonji is having nightmares, so his brothers want to plant lavender to help him sleep. And with all the new Sword Warriors arriving, the citadel is getting crowded, so it's Hakata to the rescue with his buried treasure!