Magic Stone Gourmet: Eating Magical Power Made Me The Strongest Volume 5

White Night Castle is shocked by the Ein’s sudden and drastic growth spurt. Only he and his grandfather know the truth behind this metamorphosis, but they have vowed to keep it a secret. Meanwhile, Ishtarica prepares to settle the score with Heim, and the royal family is dispatched to a neutral island for further negotiations. However, Warren appears to be especially wary of this course of action. Following an exhausting battle of wits, Ein and the royals return to home to discover that Magna has been nearly burned to the ground. Just what happened while the crown prince was away? And does he have a hope of saving the now-ruined city?

[From J-Novel Club]