I'll give a short explanation of what happens when you click the お知らせ/News tab on your navigation bar.

After you click on the News Tab, you will see a popup. This could have any number of notifications, but for this page's sake, mine has two, as shown below.

This popup is teling me:
  • I have 1 Gift waiting to be received.
  • One of my Boyfriends has finished Arubaito.

You cannot cause much harm with this tab, so feel free to click and explore whatever comes up.