Kempeitai and Horlas
The Gill Men weren't the only monstrosities the Japanese found in the jungles of Brazil. The rubber industry there was largely developed and run by Japanese immigrants and one plantation manger with strong ties to his homeland reported strange unseen creatures troubling his workers. A special Kempeitai team was smuggled in, and found evidence of the creatures. They set out to trap one, being versed in their own form of shadow walking. Floor boards were arranged to squeak, coal dust spread, and thread strung to wind chimes. Nets, caltrops and darts were readied. In the end they lost several agents but brought down one of the unseen creatures. Chained and caged they began its interrogation. It called itself a Horla. After some negotiation several Horla's were recruited for the Axis cause. They devastated a special ops group in the Phillipines and killed several Australian officers and ministers before one survivor told what was going on. An Agent Unseen was sent to deal with