"Luffy! The All-Out Lion Bazooka!" is the title of "One Piece" season 8 episode 728 which is set to be released on Sunday.
For online live stream of episode 728, you can go to One Piece Official. Other sites where you can watch it online are Funimation and Crunchyroll. Viewing access may depend on your region.
In episode 727's Recap, "A Massive Counterattack! Doflamingo's Awakening!" aired last Jan. 24; Luffy continued the fight with Doflamingo.
"Zoro, Kin'emon, and Kanjuro head off to stop the Birdcage as Luffy continues battling Doflamingo," as narrated in "One Piece" Wikia.
"Luffy's Gear Fourth punch sends Doflamingo flying through several buildings, and the citizens below stare in awe, deciding to cheer Luffy on despite not knowing who he is. On the Flower Field, Cavendish watches Luffy's new form in astonishment, but Law says that Luffy is overusing his Haki, confusing Cavendish. On the palace rooftop, Jesus Burgess searches for Luffy and sees him bouncing through the town. Koala, who hides behind a pile of rubble, remembers Burgess from the Corrida Colosseum and wonders what he wants with Luffy. Meanwhile, Viola, Hack, and Usopp have reached the Corrida Colosseum, and Viola contacts Riku Dold III. Dold asks if Doflamingo was the only one left standing, which Viola confirms."
"Meanwhile, the people on Dressrosa continue running from the Birdcage, but start losing hope. However, Riku Dold III galvanizes them by revealing that only Doflamingo remained standing and that Luffy would free them."
For "One Piece" season 8 episode 727 live stream, you can go to this link or this link, according to Korea Portal.
"One Piece" season 8, episode 728 was directed by Katsumi Tokoro, with screenplay by Tomohiro Nakayama, according to One Piece Podcast.
Catch "One Piece" season 8 episode 729, "Flame Dragon King - Protect Luffy's Life" on Feb. 7.