@XPearse Honestly, some gag comics based on games or other properties don't require you to know about the original source material or characters that much for you to "get" them. "Project Tokyo Dolls - Lazy Idol Yamada's Life as a Youtuber" being the chief example that I can think of where you don't need to know the original work to figure out the characters and laugh. Also, as of this week I do play the game now, since it's been released in English. While the comic makes more sense now, I still think that a lot of it feels "filler-y" and that a little bit of quick exposition for each character (even if it's hidden subtly in how they act when they appear and how they're introduced) wouldn't hurt.
Maybe not as heavy-handed as every character referring to each other by name (or codename) at the start of every issue, 90's comic style, but just a quick bit about who someone is and what they're about. Since most of the girls in the game are basically designed around 1 or 2 simplistic "charm points" or defining traits, probably wouldn't be too hard. Seems like the designers took the "Azur Lane" style philosophy of "Keep the theme simple, so the player can get it right away and not get confused."
Not that I think that the Magia Record girls are overly simplistic by any means, just that they're simple enough to intro smoothly without taking too many panels.