Haruna Sakurai

Earth Energy is a force generated naturally by the Earth's rotation. A mysterious alien enemy from space known as "Dark Spinner" has invaded Earth in order to steal the Earth Energy and transform it into Dark Energy. The only ones who can stand up to stop them are twin brothers named Raiga and Kuga, who are fighting together with the earth defense team Earth Granner. But will they be able to protect the earth? (Source: Tomica Wiki)

Through an unexpected turn of events, an ordinary elementary school student, Hiro Enryuu, finds himself in the world of the "Dragon Collection" game. This is a world called Dragon Earth, where gods, humans, and monsters exist side by side. Those who roam this world using a magic book, called a Grimoire, and cards to summon monsters and search for treasures that bear the powers of dragons are called Dracolle Battlers. Despite his bewilderment, Hiro becomes a Dracolle Battler and, together with the friends he meets there, begins his adventure to become a legendary Dragon Master! (Source: Crunchyroll)