Tsui Agawa had lived a typical life in the modern era, filled with simple joys such as playing with dolls in her youth, graduating from high school, and finding a job. However, her reality took a drastic turn when she woke up one night in an unfamiliar outfit in a park, realizing her memories were in shambles. As she unraveled her memories, she found out some of her memories were in contrast with real life.
In a different part of the same park, a man from another world found himself transported to modern Earth. He quickly learnt the fact that he was no longer in his own realm and embarked on a quest to find a way back. Amidst his efforts, he crossed paths with Tsui, who looked identical to someone from his world.

(Author's Note: This series has a slower buildup, but they are all important details that will matter in the story. The story progress gets faster starting Chapter 7. Prologue is optional)