That is where I'm always checking. I check all the timed towers. It would tell me to find teammates before picking my character too right? I enter every tower and then back out if it tells me to pick a character.
I've had the game a week or so and I play 5+ hours a day while turning it on other times just to check the towers. In all this team all the 1 enemy towers I've found are still solo towers. Are these teamwork towers really that rare?
Itsuka Kotori from light novel Date a Live. There are two visual novels on ps3(soon coming to ps4, even in the west if I am correct) I used an image from one of them. Sadly, now you can only choose from the games you own.