69th Chapter!!!! SIXTY NINE!!
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From the way Arun saw it, getting into the village undetected was nearly impossible. He knew that he could not just waltz his way in, he would need some sort of cover. As far as these guys were concerned, they could get in. But at the same time, he could also blow his cover, so he needed to include these guys in his plan.
As they already knew about the Familias, he spun a tale in front of them that he belonged to a Familia of Athena. And if he cannot waltz in the encampment of the enemy Familia. So he needed their help in order to get him in, with them, without arousing any suspicion. As they guys trusted him and believed in his story easily, the rest was fairly easy.