I was looking for manga adaptations of the Rising of the Shield Hero story and noticed something odd. Or at least something I haven't run into before.
The tittle of the manga was often appended with the qualifier "The Manga Companion", like on Amazon. I also saw the following phrase repeated some some stores:
This is the Manga companion to the Ultimate Light novel series.
What does the "companion" qualifier mean in this context?
Is it common for a manga adaptation of a light novel to have this qualifier?
Does it imply that the manga isn't intended to sand on its own, or am I just reading too much into the word?