The creator of Kagerou Project, Jin (Shizen no Teki-p) has said that the Mekakushi Dan would be your friend, but wouldn't you like to see how that would actually play out? That's where we come in!
Tomodachi Dan is a fanmade visual novel where the Player gets to spend a day with each member of the Mekakushi Dan! Eat ice cream! Commit fashion crimes! Get to know everyone a little better! Make friends! Or don't, it's up to you.