Hunter x Assassins

After Greed Island Gon and Killua are unfortanley send to a place called The Empire. Thinking is just another place that Ging went, they go and make a friendship with a boy named Tatsumi. However both see the horror and corruption that the place has. Gon is shocked while Killua is not that horrified. Soon they join a group called Night Raid to help free the people from these horror