One Piece: After Becoming Invincible, I Came Out of Retirement!

Synopsis: Cass was once a young sword prodigy, but when he challenged Roger, he was defeated by Roger's Divine Departure. He then secluded himself on Mount Tianmen and spent more than a decade cultivating his understanding of the Way. When he finally emerged, he cleaved the heavens with a single sword. He carried osmanthus wine to share again, visited old friends, met the younger generation, and relived the carefree days of his youth!

Garp: "He already had the strength of an admiral back then. Now? Even three admirals together couldn't withstand a single sword strike from him!"

Ace: "Hey, Senior Cass, thanks for the guidance! When we meet again, I'll definitely take that sword strike of yours!"

Whitebeard: "His strength has already surpassed Roger's. Even I can't see through him anymore!"

Mihawk: "That was one truly exhilarating battle!"

Kaido: "Hey, hey, hey! Your Haki is ridiculously strong now, Cass!"

Luffy: "Senior Kaku is so cool! I want to learn from him!"

Zoro: "So this is the power of a swordsman at the peak? That's exciting!"

A year later, the Paramount War takes an unexpected turn. Cass leads Garp, Mihawk, Shanks, Granny Haitang, and others in beating the Celestial Dragons and trampling the Five Elders. At last, they force Imu to appear, and an unprecedented ultimate battle is about to begin!