Honkai Impact 3rd: Striving to Stay Alive

A Happy Life Beginning in the Previous Era

The protagonists are siblings

Probably a one-on-one pairing

Through a thousand years of frost and dust, through two lifetimes of flourishing and decline, this body has been tempered.

A thousand trials have forged the bones, while a spark still burns; ten thousand torments have seared the soul, yet even iron grows warm.

The power of thirteen finally gathered in one grasp, breaking the night and becoming dawn, its light reaching ten thousand gates.