Transmigrating into the World of Kamen Rider Decade

An extradimensional being took Sato Ichi's life while invading another dimension. It discovered the hidden dark energy within Sato Ichi, so after granting her wish, it sent her to another dimension and gave her the powerful ability to travel between dimensions.

A being of the same frequency as the extradimensional entity took on the form of a human called the Author and entered his world as well. But then disaster struck: Sato Ichi lived only until the age of seventeen in that world, and her life was once again at an end. To save her, the extradimensional being known as the Author stopped Sato Ichi's time, keeping it frozen until the story began.

A girl ventures into another world, embarking on a journey through many different worlds.