Several days after the mortal battle against Link Joker which embroils the whole world, the world has returned to peace. 
But Kai Toshiki faces a surprising situation. Sendou Aichi, the hero who saved the world from the invasion of Link Joker, has suddenly disappeared. In addition, everyone's memory about Aichi is lost...Almost all hints have been lost, and Kai starts to search Aichi with "Blaster Blade" and the deck of Royal Paladin, the only existing hint and the proof of their bonds. 
Kai is approached by fighters who call themselves "Quatre Knights". The four---Gaillard, Neve, Ratie and Sarah---are fighters with world-class power in vanguard fights. They control mysterious power and urge Kai to give up searching Aichi. What is their purpose...!? And what is their relationship with Aichi...!? 
Kai, with the new power "Legion" in his hand, fights to take Aichi back. Now, the war has begun! 
 
(Source: Cardfight!! Vanguard Wikia)

Episode 164 - The Missing Leader

Episode 165 - Legion

Episode 166 - Aichi's Shadow

Episode 167 - Seek the Mate

Episode 168 - Naoki's Fist

Episode 169 - Blue Flames Gaillard

Episode 170 - Steel Neve

Episode 171 - The Leader, Kai

Episode 172 - Introducing Great Daikaiser

Episode 173 - Illusional Rati

Episode 174 - Freezing Ice Serra

Episode 175 - Ren's Promise

Episode 176 - The Place Where Aichi Will Return

Episode 177 - The Announced Truth

Episode 178 - Island Awaiting the Wind

Episode 179 - Kai's Will

Episode 180 - Gateway to Sanctuary

Episode 181 - Manly Big Bang

Episode 182 - Steel Will

Episode 183 - What Doesn't Change

Episode 184 - Vow of the Blue Flames

Episode 185 - Flames of Perdition

Episode 186 - Interrupted Sleep

Episode 187 - Aichi Awakens

Episode 188 - Cold Ambition

Episode 189 - Omega's Return

Episode 190 - Determination of the Bluish Flames

Episode 191 - Our Place

Episode 192 - Pride of the Flames

Episode 193 - Sword of Destruction

Episode 194 - Sword of Courage

Episode 195 - A Season for Journeys

Episode 196 - The Vanguards

TMS Entertainment

Cardfight!! Vanguard Legion Mate