Congratulations, you've been hired by an organisation defending earth from

whatever it is this time with the traditional giant robots.. Unfortunately, you were hired by the accounting department. Manage the budget, prevent the earth from destruction and deal with the insurance claims from the battles. Battles should happen at random or on a timer against progressively stronger enemies. A budget grant is given each month, from which salaries are paid, research and development is funded and repairs made.

I'd like to suggest setting this in something similar to Neon Genesis Evangelion.

The sheer level of destruction in most anime with giant robots would let you do something fairly generic. Or Gundam Wing, except you'd be working for the bad guys.

Extra funding could be obtained through research grants, bake sales and embezzling/extorting from major governments.

Image sourced from http://siato0.deviantart.com/art/Evangelion-Motiva..., by Siato0.