Problem children are coming from another world, aren't they?

"On a world known as Little Garden, factions and communities compete for power via Gift Games, in which individuals with unusual abilities are set against each other. ... Earth-born Izayoi, Asuka and Yo don't know any of this when they accept the invitation to come to Little Garden, nor do they know how dangerous the games actually are. Fortunately, all three are far more formidable than anyone can imagine"--Container.