・About Online Multiplayer

You can play online multiplayer using Steam's Remote Play Together feature.

First, download the following free game on Steam:
https://store.steampowered.com/app/891190/CROSS_X_CARROT/

Next, open the game's Properties from your Steam Library and browse to its installation folder.

Replace all files in that folder with the files from Boragon Doll.

After doing this, launching CROSS_X_CARROT will start Boragon Doll instead.

Then, select the person you want to play with from your Steam Friends list and choose "Remote Play Together."

You can now play Boragon Doll online with your friend.