Sono Monban, Saikyou Nitsuki: Tsuihou Sareta Bougyo Ryoku 9999 no Senshi, Ou Miyako no Monban Toshite Musou SuruSono Monban, Saikyou Nitsuki: Tsuihou Sareta Bougyo Ryoku 9999 no Senshi, Outo no Monban Toshite Musou Suru; その門番、最強につき～追放された防御力9999の戦士、王都の門番として無双する～; That Gatekeeper, Because He is the Strongest ~ The Exiled Warrior with 9999 Defense Power, Unmatched as the Gatekeeper of the Royal Capital; 那個門衛最強～被退隊的防禦力9999的戰士，作為王都的門衛無雙～; Ese guardián de la puerta, porque es el más fuerte ~ El guerrero exiliado con 9999 de poder de defensa, inigualable como guardián de la puerta de la capital real.

Sieg is an adventurer with an incredible defensive power, and he always uses himself to attract the monsters' attention to assist his teammates. However, the party leader just focused on offense without realizing Sieg's intention, so he kicked him out. After Sieg left, the team repeatedly failed multiple quests ... At the same time, Sieg took the position of gatekeeper at the Royal Capital. Thanks to his defensive power, he was quickly promoted to division captain. His subordinates included a carefree big-breasted Swordswoman, a perverse freakish girl, and an Archer with an erratic temperament. He and the girls started slowly gaining the trust of people around them!