This is an ancient haunting story but that took a new look recently. There were recent reports of hearings of laughing little girls at night in the jungles outside of Pleiku, Vietnam. But those occurences seems to date from quite some times, at least that's what several farmers of the area reported. The local authorities are clueless about this for no traces of anything was found when investigated by the police.
Giang Long, an old vietnamese reporter that had worked with one of Aka's former identity, 'Rabendā Sanjuro' a reporter, had contacted him about this. After investigating the case on his own, he found that during the Vietnamese independance war, an US unit conducted operations in the area, allegedly enlisting ghosts in the war. He could not find more and that's why he contacted 'Sanjuro'.