Talk:FAQ/@comment-26487694-20150611202554/@comment-26215551-20150611204150

It's asking you if you want to use a Dango or Sakura Bento for your party. The effects of these items can be read up here, but they essentially restore Fatigue, and grant Sakura Fubuki status, respectively. Currently you have none of either so you cannot use any (hence the grayed out button). The pink button on the bottom takes you to the Shop, where you can buy some if you wish.