Hiiro Ryugasaki, a boy who attends Tensei Gakuen. Hiro wanted to play the popular digital card game "Shadowverse", commonly known as Shadowverse , but his grandfather Shigefumi didn't buy a smartphone. One morning, Heero tries to go to school as usual and hears a mysterious voice calling himself. Guided by that voice, Heero enters the warehouse at home. A brand new smartphone was placed in the warehouse ...