Devastated at the death of her four-year-old daughter, a grieving middle school teacher is horrified to discover that her students aren't as innocent as she thinks.
100 years ago, titans suddenly appeared on Earth. Soon, human civilization veered on collapse due to the titans. Humans then built a giant wall to defend themselves. Within the giant walls, humans lived in peace, but, 100 years later, the giant wall is broken.
Momoko is an ordinary girl, living an ordinary life. Ordinary, that is, if you define ordinary as wearing elaborate lolita dresses from the Rococo period in 18th Century France. However, when punk girl and self-styled 'Yanki' Ichiko comes calling, her days as 'ordinary' are most certainly numbered...
