In Naruto, the battle between Kay and Ben is in episode 638. In this episode, Kay used eight doors to escape from armour, and Ben was very excited, because this was his first time to fight with eight escapees. At first, Kay used the seventh gate, but the speed still didn't completely keep up with the sunspot. Later, Akai was ready to fight to the death and opened the door to death. Spot is also very excited, saying: it is extremely rare for people with eight doors to escape from armor. I'll play with you for such a good chance. Akai realized his death and started the final battle.
Akai is a warm-blooded man, and the word "youth" is always on his lips. He and Hatake Kakashi are friends and rivals, calling Kakashi "eternal rivals". Although he is not good at Ninjutsu and illusion, unlike Xiao Li, Kai can use Ninjutsu, but he is better at body art and is a master of body art, which makes him extremely active in various tasks and battles.