there are two theory's why it hasn't been brought out that i have, 1) they want people to play the single player, and 2) they are ironing out as many bugs as possible, maybe both might not be either of them...
Sorry to bring in the news, but this one just got updated again not too long ago. I'm not terribly interested in the game, so feel free to take your time to update it. 敗戦隷姫エルネア to v25.04.23