This isn't anime but I think this is related here. PLOT: When evil threatens Akihabara, three "youths" (a Super Sentai otaku, a cosplay otaku, and a closet anime otaku) receive technology from a beautiful scientist to fight against it. Basically it's Power Rangers with moe culture. Here is the first episode. http://www.jefusion.com/2012/04/hikonin-sentai-akibaranger-ep-01-sub.html EDIT It is unlisted in youtube so I can't embed it here.