Sonic and Sega Retro Message Board: Emerald Master - Viewing Profile - Sonic and Sega Retro Message Board

To start off, so there's no confusion. I am going to romanize まぢん as "Madin" in this post because, even though it's pronounced almost identically to Majin (まじん), they are different, and that difference (and similarity) comes into play here. Second: I am not familiar with Shenmue (yes, it's relevant), so I might use some terminology that differs from the official English translation.

Anyway. Some quick Googling led me to a post from 2002 on the sega.co.jp BBS with a link to an interview explaining the appearance of Madin in Shenmue. The actual link is dead, but fortunately an archived copy of the page exists here.

The interview, by someone named NOZX, starts by introducing the question: two items, labeled "Madin Milk" (まぢん牛乳) and "Madin Magazine" (まぢんマガジン), can be found in the Tomato Mart in Shenmue. So what does Madin mean? Is it—as some people have assumed—a play on the word majin (魔神, demon god/devil)? Or perhaps "margin"?

NOZX asks someone named Mami, who was apparently responsible for designing the objects, what the word means. She responds: "Mr. Nishimura told me to make them, so I did."

So NOZX then goes to speak with Masato Nishimura to ask him:

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That's all the relevant information in the interview. There's nothing that mentions the use of Madin in Sonic CD, but the same Masato Nishimura was also on the staff for that game, so I think it's safe to assume it has the same origins.

However, I have run into a (very, extremely) loose possible connection between Masato Nishimura and that image. This tweet from 2011 posted by someone named まぢん (Madin, though his account name is Mazin__, another possible romanization of the word) mentions まぢん画 (the text in the Sonic CD image) in response to a comment (presumably referencing the creepy face of the Sonic ice cream) that says, "Sega Japan does have that wallpaper..."

Mazin__ is also (at least right now) using an icon with the Madin Milk graphic from Shenmue and his profile hints he works at Sega (specifically, it says, "I do not speak for Sega," which I've noticed is pretty common on staff Twitter accounts). So it's a lot of speculation, but it seems to me like Mazin__ is probably Masato Nishimura's personal Twitter account, and he at least acknowledges the existence of the Sonic CD image, though he doesn't say anything about having made it or having had anything to do with it.