One day, an ordinary high school girl by the name of Ichika Kotobuki saves a dog on the verge of death on the side of the road. However, all of the sudden, the dog transforms into a human. As a consequence, Ichika gets dragged into an event that runs once in a thousand years known as "Eto Battle"!

Miharu is smart, attractive and talented. One could say he's been playing life in "easy mode." That is until a teddy bear steals his wallet and a strange man comes out of an arcade game and demands Miharu play a game; the D-game! What's worse, the man even claims to be from the future. What will happen when Miharu must play to survive?

(Source: MU)