Two people separated by time and space must unravel their tangled history before the world comes to an end.

Chirin, a newborn lamb, and his mother live a peaceful life in a meadow. As long as they stay inside the fence that protects them and the rest of the flock, they are free to frolic and graze on the delicious clover leaves. However, their idyllic life is shattered when a wolf named Wor attacks them in the dead of night, killing Chirin's mother. Struggling to process his mother's death, Chirin swears to become a wolf himself in order to avenge his mother, unaware of what this transformation would cost him.

Ginga, a small town girl sets out to become the Emperors Seihi, highest ranked wife, undaunted by the many other women who seek the same title. Her energetic and eccentric ways aid in her in meeting new people, training to be a Lady of the Emperor and dealing with the drama that ensues.

A world where it has been established that people routinely swing between slightly different parallel worlds... Koyomi Hidaka, who lives with his father following his parents' divorce, meets a girl named Shiori Satou at the research institute where his father works. They both have a little crush on each other, but everything changes when their parents remarry. Koyomi and Shiori, convinced that they will never be together, try to jump into another world where they won't be step-siblings... There's no meaning in a world without her.