The sword art of the Hiten style. Its lineage long, its history tragic and bloodied, it was and is considered to be the epitome of sword mastery: It can have only one successor. It has been ten years since Zelos had left, but Irelia still awaits for his return. She kept her promise, to defend Ionia, no matter what. Even now, although a floating castle approaches, she waits for him

It's a Riven driven story, her interacting with champions, her thoughts, her coming face to face with Ionians and so forth. It is not a shipping story of Riven x CHAMPION, it is character and plot driven.