Any lover of science fiction, action and, of course, manga should enjoy "World Trigger" by Daisuke Ashihara. The unlikely hero, nerdy Osamu Mikumo, is a part of an elite monster-fighting organization called "Border." The world is in constant danger from grotesque invaders from an alternate dimensional called "Neighbors." Osamu relies on his trusty "trigger" device to transform him into fearsome fighting form.