One month passed after Fein and Sofia separated. Fein experienced the unique beauty of the island. Just like he thought, the whole island was infested by savage monsters and all of them were S ranks. Suicidal S-rank monster that doesn't care about their lives. They didn't display the intelligence of S-rank creatures that must have.
The monsters he countered were manic and would attack him as soon as they laid their eyes upon him. The only part of the island that isn't infested with monsters is the outer perimeter where Fein built their temporary base.
The creatures all over the island were crazy that Fein began to doubt that something was affecting their behavior. It may be someone deliberately influencing the monster or it is the problem of the environment.
Fortunately, Fein let Voli accompany Aoi and Sofia, as the danger on the island was beyond his expectations. Well, not dangerous to him, but to Sofia, to some extent.