Saving the World is a Two Person Job

Lifelong friends Aerin and Keisuke are yanked suddenly into another world, where a powerful sorceress has seized all magic for herself and established herself as supreme empress of the world. Somehow, the magic meant to instill in only one of them during summoning gets split between both, instead. That might be for the best, though, because it'll take more than one person to pull off this world-sized rescue mission. Updates at least once a month.