Kuni ni Saikyou no Barrier wo Hattara Heiwa ni Narisugite Tsuihousaremashita

Story:

A young man, Shield, can only use the beginner magic "Barrier" and has been looked down upon. Despite putting up an ironclad barrier to protect the country, he is deported due to his fiancé's tricks. However, before he knew it, he had subjugated the strongest dragon (a young girl), was courted by beautiful women from other countries, and was being followed by a group of brutal demons! ? A new type of battle action begins, woven by Shield, a young man who can only protect himself, but whose defense is the strongest!!