Are the subtitles standard?

They are synchronized with the video, as in the version I released in Italian.

Is this series a continuation of the UFO Robo Grendizer series?

No Yuna232, this is a remake with the story a bit twisted, as if they had combined the three films with Grendizer and Mazinger Z. The man who fell into the desert has no memory. Koji Kabuto picked him up and named him Daisuke. Koji has two faces: a billionaire and a champion of justice, thanks to his wealth made from the power of photons, a clean energy source. Although Daisuke has a somewhat shady side, he possesses extraordinary talent, and Koji begins to trust him. Just as it seemed that peaceful days would continue, unidentified aerial phenomena began to appear over major cities around the world. It is the Vega Star Alliance Army, attacking from a star system far away from Earth. (www.animenewsnetwork.com)

Thanks, bro

Sister, actually . You're welcome (⌒▽⌒)☆