Operation Undead Episode 1

1941: World War II in Chumphon, Mek, a new sergeant, and Mok, his younger brother in the Youth Soldier unit, face a mysterious threat when "something" belonging to the Japanese goes missing during their landing. This leads Mok and his fellow youth soldiers to encounter horrors far worse than war. Even after Thailand and Japan declare a ceasefire, Mek receives a special covert mission to clean up the area alongside a Japanese combat unit, unaware that this might include his own brother.