Tomoshibi no Otr

The world is encased in winter due to the advances of the Ice Kingdom. Kind-hearted Otr, who dreams of being a warrior like his dad, has been entrusted with keeping the fires burning as a cook in the fortress. But when the fortress is attacked by the demonic army of the Ice Kingdom, the people and the flame are in danger of being snuffed out. Can Otr awaken a power that can turn the tide? A hero's journey of fire and ice now begins!

(Source: MANGA Plus)