「他のユーザーと手合わせしよう」 Mission is kind of deceiving on how to complete but you need to click on one of your friends then initiate a friendly battle with them and it will complete it
「他のユーザーと手合わせしよう」 Mission is kind of deceiving on how to complete but you need to click on one of your friends then initiate a friendly battle with them and it will complete it