Mondaiji-tachi ga Isekai kara Kuru Sou desu yo?

Synopsis

Izayoi Sakamaki, Asuka Kudou, and You Kasukabe, three children with extraordinary power, each receive a mysterious invitation and are suddenly transported to a world called the Little Garden. There, they are greeted by a rabbit-eared girl known as Black Rabbit, who informs them that the world revolves around 'Gift Games,' which challenges it's players with games of varying danger while betting something in exchange for rewards if they win. Furthermore, Black Rabbit informs them that they should be in a community to join the game. Then, Black Rabbit first tests the children with a card-based Gift Game without betting something, which they manage to win after a tactic by Izayoi, although Asuka and You protest that his method wasted the strategies they had made. The group make their way to a rural village in eastern district and meet Jin, current leader of the former "John Doe" community, a community where Black Rabbit is in. After finding out that Izayoi sneaks off to find the edge of the world from Asuka and You, Black Rabbit rushed in an incredible speed to find him while boasting herself as a rabbit, an elite race in the Garden which are servants of the Garden’s creator and holds the right to be a Judge Master. At the edge of the world, Black Rabbit found Izayoi, fighting a water god in a Gift Game and manages to beat the water god, rewarding him a big water tree sapling. Izayoi know that Black Rabbit is hiding something from them and asked her the reason for summoning them. Meanwhile, Asuka, You, and Jin are waiting for Izayoi and Black Rabbit in a cafe, before they are approached by a dark-skinned, blonde-haired man named Galdo Gaspar, leader of the "Forres Garo" community.

(Source: Wikipedia)