I need to figure this game out. I think this game might actually be good.
so i posted some translations in the comments and also went looking for more info
the name is printed in romaji on the box as "Nemu Lu Mayu" which...if you can't find more info on the game, that might be why
apparently it's also printed in English as "Sleeping Cocoon"
there's a story blurb on the front printed in romaji; since it was low-hanging fruit, i thought i'd translate it real quick
We can't escape our cocoons! Please, take us from this place! Enter the sealed labyrinth and defeat the ones who have consumed our souls! To that end, we would do anything...we would do ANYTHING. So, I beg you...take us from this place!
i'll see what i can do with the text on the back later~
Someone on Bluesky linked a blog post by Melos Han-Tani with some more background and translation.
It's a dungeon crawler set inside of four labyrinths/'spirit worlds', inside a a 'magic book' (??). While I have trouble 100% understanding the plot, the gist of it as that in the 1300s, some magic book appeared, which caused a lot of people disappear. However, one person managed to escape! But then the Black Death made everyone forget about the book... until present day, when you get sucked in (or something). Inside, you meet four "???" (Great Spirits), who have been trapped in there for a long time (...I think?) Anyways, they want to help you escape, and undo a curse. You also visit the memory of some other person who tried to defeat the "Sealed King", and the four spirits wonder why the person gave up. So you're tasked with investigating the four spirit worlds (red, white, black, blue), with the help of the four spirits.