Kagemori Mamoru is a dowdy boy whose hair is disheveled and who wears thick glasses, but he is actually the son of a ninja family. They have protected their neighbors, the Konnyaku family, secretly for 400 years. Mamoru has personally protected their daughter, Konnyaku Yuuna, since they were in kindergarten. When Yuuna is in trouble, Mamoru puts on ninja suit and turns into a competent ninja to help her.

The three Kisugi sisters—Rui, Hitomi and Ai—during the day run a small cafe called "Cat's Eye." To discover the whereabouts of their father, the artist Michael Heintz, who has disappeared, Hitomi and her sisters rob art galleries as the smart and mysterious thief "Cat's Eye" in the hope that his works can give them clues about his vanishing. The crucial point is that Hitomi has a relationship with Toshi, a police inspector who has sworn to catch "Cat's Eye"—and of course he has no idea about Hitomi's double life. (Source: ANN)

The year is 20XX. The ninja, who once forged the history of Japan, were scattered across the country during the Meiji Restoration. As these ninja mingled with the other clans, their bloodline thinned, and they gradually faded from sight. The descendants of these ninja clans, seeking to preserve their heritage, formed the WNA (World Ninja Association) in the hope of carrying on their legacy. And so it was that the WNA succeeded in developing Ninja-Gum, an art which could summon forth the strength of the Shinobi. And yet creating the most powerful Ninja-Gum requires the strongest of ninja DNA. So it was that the Ninjala Tournament was held, that the mightiest of all ninjas could be found...

The second half of the second season of Cardfight!! Vanguard G series.