Dokkoida?!

, is a Japanese light novel series written by Taro Achi, with illustrations by Yu Yagami. The series began publication on May 10, 1999 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
The Galaxy Federation Police (GFP) desperately wants to cover-up its personnel shortage with new mechanized power-suits. Suzuo, 19-years old, desperately needs a job. Tampopo needs an earthling to fit the prototype of her company's suit and declares Suzuo the perfect candidate! Strong competitors and the wacky A-class criminals fight against our hero in diapers, but they must not recognize each other out of costume or the test results will be a failure- but it's OK if they all live in the same apartment building to save money, right?

Dokkoida?!
An anime adaptation of the light novel, produced by Ufotable, aired for 12 episodes between July 5, 2003 and September 20, 2003.