Strange incidents occur one after another in the streets of Asakusa. Using artifacts from the Edo-Tokyo Museum scattered throughout the town as clues, Asako pursues the truth behind six mysterious cases. With each case she solves, Asako's lost memories and her family's secrets are gradually revealed. Join Asako as she tackles the enigmatic incidents unfolding in Taisho-era Asakusa and recovers her lost past.

An 18-year-old girl searching for her lost memories. Guided by mysterious floating sparkles, she possesses the supernatural ability to read people's experiences and past. After graduating from girls' school, she joins a detective agency in Asakusa run by her father's friend, becoming an apprentice detective. While she may appear naive and sometimes confuse those around her, she combines inner strength with sharp insight.

A 45-year-old born and raised in Asakusa. Called "Asakusa's master detective" for his keen observation skills and deductive reasoning. Though gentle in nature, he becomes calm and composed when dealing with cases. While intrigued by Asako's mysterious powers, he also shows a paternal side in trying to protect her from danger.

An active boy attending Asakusa Elementary School. Accompanied by a monkey he found, he provides unexpected testimony that holds the key to the coin box thief case.

A poet, Buddhist scholar, and novelist, also known as the mother of Taro Okamoto. She provides a major clue about the missing black cat.

A mystery writer drawn to bizarre incidents. He shows interest in the Western restaurant owner case and cooperates with Asako's investigation.

A popular artist known for his ethereal portraits of beautiful women. He meets Asako while searching for his beloved cat, and fragments of memory hidden in his paintings lead to the truth of the case.

A mysterious figure wearing a strange mask who appears nightly at the Asakusa Twelve-Story Tower. He appears to have a close connection to Asako's lost memories.