"We share the same brain. Everything you know, I know and vice versa."
After her ninja clan's ancestral home is attacked, Gabriella manages to escape. Deep inside the compound she accesses the Natsugami clan's computer system with the help of with "Harugasumi", an AI system that enhances her brain functions.
Inside, she finds an opportunity to carry on a mission left to her by her ancestors. Will she be able to fulfill it and survive the attack on her home?