Ruuga Kaizu is a character in Cardfight!! Vanguard G and Cardfight!! Vanguard: Shinemon Arc. He was first introduced in Cardfight!! Vanguard G: Z. He was diffridden by Valeos, one of the Apostles and the user of the Magallanica Zeroth Dragon, Zeroth Dragon of Distant Sea, Megiddo. 

In Shinemon Arc he's part of Team Dragon's Vanity, a special team assembled by Esuka Hibino to participate in the S-Cup with the objective of defeating Shinemon and Team Capital. He has a history with Rive Shindou.
(Source: Cardfight!! Vanguard Wiki)

This is the story of "Shinemon Nitta", the future manager of Card Capital.
 
10 years before the reunion of Aichi Sendou and Toshiki Kai, the card shop run by the Tokura family "Card Capital" was going out of business. Then came the attempt to take over the store by Esuka Hibino, the owner of a major card shop.
 
In order to protect Card Capital, Shinemon Nitta stands up as the "Self-proclaimed Manager!"
 
(Source: Cardfight!! Vanguard Wiki)

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