Gigan's DOOMed Brother

Many, many years ago, when Gigan was young, she had an older brother.

He was immensely strong. Capable of leveling mountains in a single punch. He preferred heavy brutish attacks over the normal carefully planned assaults that their species was known for. Due to this, he was slightly ostracized by their peers. But Gigan still looked up to him.

But one day, during an accident in a teleportation accident, he vanished. Sucked into another world. Over time, Gigan forgot her promise to her brother to protect those weaker than her.

But when a mysterious Kaiju emerges from a sort of tomb, the owner of an armor everyone is after, why does this strange new warrior seem familiar to Gigan.