初級魔法『バリア』しか使えず見下されてきたシールド。国を守る鉄壁のバリアを張ったにも関わらず、婚約者の策略により国外追放されてしまう。しかし気付けば最強のドラゴン(幼女)を屈服させ、他国の美女たちから求婚され、凶悪な魔族集団に付き従われていた!?守りしかできないけど、その守りが最強すぎる青年・シールドが織りなす、新感覚バトルアクション、開幕――!!
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!!