
The sky, cloaked in clouds — the World of White. On a rainy day, Airi, a second-year high school student living a quiet and ordinary life, encounters a mysterious young man on her way home. The young man, soaked by the rain and without an umbrella, tells Airi, “I’ve come to meet you.” Filled with fear and uncertainty, Airi tries to flee, but she is soon stopped. Suddenly, she finds herself in a place she doesn’t recognize. The same young man introduces himself as the “Black Rabbit, Rain” and says to her: “Welcome, Alice. You are now the queen of this world——” Route: Black ✦ A vast blue sky with no horizon — the World of Black. A sudden rebellion erupts in the land ruled by the second heroine, Luna, the queen. The Queen’s advisors — the Black Rabbit, Rain, and the White Rabbit, Snow — seeing this as a grave danger, devised a plan: Luna would take shelter in the World of White, while a new queen would be brought to the World of Black. Thus, Luna is sent to the World of White, and Airi to the World of Black. Two girls who have switched places — what is the truth behind their two worlds?……?
The story follows two twin sisters, Airi and Luna. Luna resides in the Black World, where she reigns as its queen, while Airi lives in the White World, which is Earth. When Luna can no longer control her "Alice" abilities, the two are forced to switch places to prevent the Black World from falling into ruin.