If you're looking for manga similar to Susume! Godzilland, you might like these titles.
Something monstrous rises up from the sea and nearly sinks a Japanese fishing boat. The sole survivor tells a tale that no one wants to believe. But when a Russian nuclear submarine is destroyed in the same waters, the world is forced to face the truth: Godzilla has returned!
This incarnation of Ultraman, now called "Tiga," finds the 100-foot tall hero revived in the year 2049 and facing a world ill-equipped to handle the onslaught of gigantic beasts that are peppering the globe. Relying on his martial-arts prowess and his three modes of combat - Sky (flight and speed), Power (strength), and Omni (a balance of the two) - Tiga goes toe to toe with the most terrifying collection of monstrous giants and alien invaders ever to plague the planet.
Several years after the tragic event in 1989, Akira Yuki plots his revenge in taking on the most monstrous nuclear menace known to mankind-Godzilla! However he's not the only one whose targeted the King of Monsters. The intergalactic tyrant SpaceGodzilla has also aimed his sights on Godzilla! Not only that, but the entire world as well! Two Godzillas, one earth, who will remain and hold the crown?