Akiha Shishido is the third daughter of the powerful Shishido family. Her elder sister, Kazana has planned to marry Akiha against her will. Akiha quickly escapes, and soons meets a mysterious brain colony that is coming out of nowhere. It is run by the recluse and most incredibly rude artificial intelligence ever: Leopard. He asks the young girl for her help in finding various equipments that would help him recover his former glory. Teaming with Konoha, a strange ninja-like girl, Akiha embarks on a journey that will make her leap from surprises to dangers! While she tries to find her true calling when going on these weird quests, Akiha will learn about the dangers posed by renegade brain colonies which could threaten the entire human race!