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

Taking place after a three-year time skip, the series will follow Shindou Kurono, Kiba Shion, and Anjou Tokoha as the new protagonists of G. Kurono uses the never-before-seen clan Gear Chronicle, which brings together the destinies of these three toward an impossible future, an impossible self signifying 'Generation.' (Source: vanguardus.blogspot.com, edited)

The main protagonist Sendou Aichi, is a timid and mundane third-year middle school boy. The thing that supported Aichi's heart, was the Blaster Blade card that he received as a child. It's an important rare card from Vanguard, a card game with the imaginary world of Planet Cray as its stage. From the day he reunited with the person who gave him that card Toshiki Kai, Aichi's everyday life began to change. (Source: Crunchyroll)

Shy and timid in nature, 15-year-old Yu-yu Kondou is constantly pressured by his wacky sisters to fulfill their unreasonable requests. One day, they force their brother to crossdress for the sake of their own entertainment, prompting him to run away from home. Following a series of unexpected events, Yu-yu encounters Megumi Ookura, a friendly girl who introduces him to Team Blackout—a group of individuals deeply involved in a card game called Cardfight Vanguard. As he increasingly connects with the members of Team Blackout—Danji Momoyama, Zakusa Ishigame, Tomari Seto, and Megumi herself—Yu-yu discovers a whole new and exciting world, one he could have never imagined without the help of his newfound friends.