Masato Kato (加藤 正人 Katō Masato?, born March 28, 1963) is a Japanese video game artist, scenario writer and director. In the early days of his career, he was credited under the pseudonyms of "Runmaru" and "Runmal". He then joined Square, and was most famous for penning the script of Chrono Trigger (based on a story draft by Yuji Horii), as well as Radical Dreamers, Xenogears, Chrono Cross, and parts of Final Fantasy VII.
Kato first worked for Tecmo on Captain Tsubasa and the Ninja Gaiden series. On his first three games, he moved from graphics, to graphics and scenario writing, to also directing the action elements. He went on to work for Gainax.
Masato stated that Chrono Cross development encountered difficulty in expanding the game world due to hardware limitations, and that they crammed as much data as they could onto the game disk. Conversely, developing the multiple game endings was seen as easier, on par with Chrono Trigger as a bonus for players who finished the game.
Kato left Square after designing the plot of Final Fantasy XI: Rise of the Zilart to become a freelance scenario writer. In addition to games for different companies, he has continued to work on Square Enix projects such as the World of Mana series, an enhanced port of Chrono Trigger for the Nintendo DS, and three more expansion chapters for Final Fantasy XI.