Mondaiji-tachi ga Isekai kara Kuru Sou Desu yo?

Japanese Title: 問題児たちが異世界から来るそうですよ?

English Title: Problem Children Are Coming From Another World, Aren't They?

Plot
Three children, Sakamaki Izayoi, Kudō Asuka, and Kasukabe Yō, live dull lives because they possess unmatched tremendous psychic powers and are bored with the regular world. One day, 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 are transported to Little Garden, a place of supernatural powers called "Gifts." There, the residents use Gifts to play high-stakes games known as Gift Games in order to earn wealth and prestige for their communities. They've been summoned by the Black Rabbit to help the community "No Name" to overthrow the Devil King. So, the three children join the fallen "No Name" community and resolve to help it regain its prosperity. As they learn more about Little Garden, they decide to overthrow the tyrannical Demon Lords in control. A completely new world filled with adventure and challenges await them and will put their "gifts" to the test.

OVA: "Onsen Manyuuki" ("The Hot Spring Fun Trip")
(温泉漫遊記)

Airdate: July 20, 2013

Izayoi, Asuka, and You have been invited to participate in a Gift-Game at a hot spring village to help the small community there find a new water source.

OVA bundled with the eighth volume of the light novel.