With incredible defensive power, Sieg is an adventurer who selflessly puts himself at risk to draw the monsters' attention and protect his teammates. Unfortunately, the party leader only values offensive tactics and fails to understand Sieg's selfless approach, resulting in Sieg's dismissal. The team's repeated failures follow in Sieg's absence.
However, Sieg is soon appointed as the gatekeeper at the Royal Capital where his defensive abilities earn him a swift promotion to division captain. Among his team members are a carefree, well-endowed swordswoman, a perverse and eccentric girl, and an unpredictable archer. Slowly but surely, Sieg and his team begin to gain the trust of the people around them.
