Asuma knew full well that he could no longer return to Konoha, so he decided to leave behind his final words. He gazed at Choji, his eyes filled with trust and expectation, and slowly said, "Choji, you are kindhearted. You cherish your friends more than anyone else. That is your most precious quality, and it is the key to becoming a powerful ninja. Believe in yourself. You will definitely become an outstanding ninja."
Though Asuma's voice was weak, every word was filled with his concern and encouragement for Choji. Choji listened quietly, tears welling in his eyes. He nodded hard, showing that he would never forget Asuma's words.
Asuma smiled, though the expression looked somewhat strained, and continued, "And, Choji, you should lose some weight." Choji could not help laughing through his tears. He promised Asuma that he would work hard to slim down and become even stronger.
However, at the very moment Choji responded to Asuma, the light of Asuma's life gradually dimmed, and he ultimately left this world. Choji was overwhelmed by grief, as though his heart had been torn apart.
After Asuma's death, Choji finally erupted. Together with Shikamaru, Kakashi, and Ino Yamanaka, he set out to hunt down the killer. During the fierce battle, Shikamaru cleverly restrained Hidan, creating an opportunity for Choji to attack Kakuzu.
Without hesitation, Choji unleashed his newly developed ninjutsu—Meat Tank Needle Chariot—and charged forward like a cannonball, slamming fiercely into Kakuzu. However, Kakuzu swiftly used Earth Release ninjutsu and easily neutralized Choji's attack.
Although Choji's attack failed to inflict any substantial damage on Kakuzu, it provided Kakashi with crucial information. Kakashi seized the opportunity to launch an attack and dealt Kakuzu a blow.
Afterward, building on the Multi-Size Technique, Choji used another new ninjutsu—Super Open Hand. His enormous palm pressed down