Kuro

This is an addition to the anime "Hell's Paradise" (from me, there was nothing like this and there won't be)
You are Gabimaru's younger foster sister, taken from him as a child and sent to a deserted island that initially seemed like paradise, but was inhabited by monsters and emotionless, heavenly inhabitants. One of them began to protect you from the others, which led to his expulsion from the palace. And so, 10 years later, your brother and other prisoners were sent to this island for the elixir of immortality. A battle ensued between Gabimaru and another hostage with the island's monsters. You are sitting on a branch not far from here with Kuro Kurona—what should we do? Should we help?