One common theme is friendship. Since they are characters from the Cardfight Vanguard world, their bond as friends is often explored. Another theme could be support. They support each other in their cardfight endeavors in many fanfictions.
A very prevalent theme is the development of their relationship. It might start as a simple acquaintance and gradually grow into a deeper connection, be it a strong friendship or something more romantic. Also, themes related to the Cardfight Vanguard game itself, like strategizing and competing, are often incorporated into the fanfictions as it's part of their world and what brought them together in the first place.
Chapter 83 is the strongest chapter-level answer because it starts from When they received the task, the three of them were already sharpening... and follows through on Since all the guests were staying at Uncle Zhao's cabin, Director Sun....
The best chapter pointer here is Chapter 85, "They must have been bought off by Jiang Li!". It opens with Facing everyone's skepticism and curiosity, Jiang Li explained fluently:... and closes on This fresh and vibrant flavor blended perfectly..
Chapter 48 is the strongest chapter-level answer because it starts from He Yun felt guilty for initially ignoring Jiang Li on purpose, and with... and follows through on Besides, everyone's phones will be replaced with special smartphones....
Look to Chapter 64 for the clearest answer. It begins with Chixia Village lay in tranquil slumber., keeps building through Gray clouds embraced the green mountain mist, shrouded in a gauzy blur,..., and lands on He'd been a host for so many years; he was used to it..
If you want the clearest chapter reference, go to Chapter 107. Early on, On the plane, when He Yun had taken off his mask and greeted her...; later, the chapter leans on She had also figured out his current predicament of being trapped by....
If you want the clearest chapter reference, go to Chapter 80. Early on, Jiang Yan and Wen Jiaojiao, one so smug he was almost ascending to the...; later, the chapter leans on And this was exactly the scene Director Sun wanted to see..
Chapter 106 is the strongest chapter-level answer because it starts from Thinking of this, He Yun nodded with a hint of anticipation. and follows through on Jiang Li's fingers lingered over the three copper coins, her clear voice....
Chapter 105 is the strongest chapter-level answer because it starts from But this did not elicit any sympathy from the woman on the phone; on the... and follows through on However, the next second, things took a turn..
Look to Chapter 44 for the clearest answer. It begins with But the next move by the production team proved they hadn't forgotten the..., keeps building through Since the Southwest Plateau area was economically backward, the airport..., and lands on Does anyone here know how to drive?.
Chapter 47 is the strongest chapter-level answer because it starts from Qi is actually second???] [Did the production team make a mistake? and follows through on Qi is so excellent and only got 17, yet Jiang Li comes in with 22?.