A Free Planets Alliance officer, Murai served in the 13th Fleet under the command of admiral Yang Wenli. He was with the fleet from the very begining, participating in the capture of Iserlohn Fortress in the Fifth Battle of Tiamat: prior to the battle, Murai expressed concern over the amount of trust Yang Wenli had placed in the Rosen Ritter's regimental commander, Walter von Schenkopp.
Murai first met Yang Wen Li while a commander assigned to investigate the mutiny at Econia. Murai's impartiality and attention to details led him to conclude that Lt. Commander Yang was the more credible side in the incident.
After the death of Yang, Murai left Iserlohn and returned to Heinessen as a private citizen. By doing so he swayed lukewarm supporters of the nascent Republic the opportunity to leave, stripping the numbers down to a hard core. He also felt it was time for his generation to step aside and allow younger leaders to carry on.