The Strongest Sage with the Weakest Crest manga volume 4 features story by Shinkoshoto and art by Liver Jam & Popo (Friendly Land).

Onetime world's strongest sage Matthias puts his energies into shoring up humanity's defenses against devastation at the claws of demonkind. But the demons have wormed their way into spying on the realm's seat of power! As Matthias unpicks the enemy's carefully laid strategies, he needs all the allies he can get! But will his decision to headhunt an ancient dark dragon for his cause backfire, burning him and the kingdom to a crisp?