Adachi spends her school days skipping class until she meets fellow delinquent Shimamura and the two become fast friends. Cutting class together deepens their friendship but soon unexpected emotions blossom.

Historically, 72% of all the deaths in London are related to dragons, fantastical beings invisible to the majority of the people. While unknown to most, some people have been standing up to these dragons. Only inhabitants of Reverse London who live in the hidden "reverse" side of London can see the dragons. Even then, only a selected few become qualified enough as witches or wizards to make direct contact with them.