However, there are two kinds of the initial prototype units; "Type Black" and "Type White". The Black E-Series are made with pure focus on effectiveness, laying importance on machine-like obedience and precision. The White E-Series, in opposition to the Black ones, have artificial intelligences which are programmed with human-like personalities and emotions. Thus the military executive staff decides to have field trials, to test which design is better in battle, prior to a pending mass-production. The player gets the role of a young major who has to train and lead a team of Type White units against a group of Type Black E-Series. Regardless of their type and function, all the units look like attractive young females. Thus, Gadget Trial can be considered a bishōjo ("beautiful girls") game.