Why does the Shield Hero manga have the qualifier "The Manga Companion"?
In short, this was done by the publisher to prevent confusion, by indicating that it is the Manga companion to the original light novel.
Currently the light novel is sold under the same name, without the appended &quot;The Manga Companion&quot; which given the similar covers might lead to people buying the light novel when they intended to buy the manga, and vice versa.
As to why they chose &quot;The Manga Companion&quot; specifically over just &quot;manga&quot;, I wouldn't know. Only One Peace Books would be able to tell us that.