Sakamaki Izayoi, Kudō Asuka, and Kasukabe Yō have tremendous psychic powers and are bored with the regular world. An envelope arrives for each person, and when each opens their envelope, they are stunned to see the scenery around them change to a world they had never encountered before. They've been summoned by the Black Rabbit to help the community "No Name" to overthrow the Demon lords.
Surprised no one started a thread on this yet. A very enjoyable series so far from Diomedea (The guys who did Campione!). Definitely one of the better series in this winter line-up.