Main screen - from here, you have access to all important screens.
At the bar you can pick up rumors and learn about the background story.
Here you can view information on various missions and pick one that suits your mech's abilities.
Beginning a mission
You can always see which part of an enemy mech you are hitting.
Here you can repair and tune you mech ...
... or buy a completely new one.
Title screen / Main menu (Japanese).