Hikounin Sentai Akibaranger

Akibaranger tells the story of three people being part of an otaku club and living in the new "Electric-Town", Akihabara. They have to fight a mysterious malevolent entity that swore to conquer Earth with cool gadgets created by a brilliant genius. However, the Akibarangers' ultimate goal is to become an "official" Sentai team. The Akibarangers' secret base/hideout is a "Sentai Cafe," a Super Sentai version of the popular maid cafes in Japan.