The Strongest Sage with the Weakest Crest manga volume 25 features story by Shinkoshoto and art by Liver Jam & Popo (Friendly Land).

Matty's plan to craft a new weapon using a transcendent crystal has come to a standstill due to a lack of materials capable of withstanding the crystal's power. The only solution is to acquire a rare metal that may possess qualities compatible with the crystal. Unfortunately, this rare metal can only be found in a dangerous zone at sea where flight magic doesn't work. Matty and his friends decide to set sail for dangerous waters in an experimental ship that has a habit of blowing up!