Ena makes her first appearance at the end of Chapter 5 as the personal tactician of Petrine, where she informs the latter that Elincia is most likely to seek refuge in Gallia.

Ena reappears at the end of Chapter 20, where she is shocked to learn that she has been ordered to lead the Daein forces stationed within Daein Keep. Denied an audience with Ashnard, Ena is forced to set out to fulfil the duties imposed on her. The Black Knight then enters the scene, notifying Ena to head out for the eastern gate of Daein Keep in order to meet an unnamed visitor.

The visitor turns out to be Nasir, who presents Ena with Lehran's Medallion. She takes notice of the medallion's heavy weight, and considers the possibility that it is under the influence of an "evil god". When questioned on her next course of action, Ena resignedly reveals that she is unable to defect from Ashnard's army due to an enigmatic desire to return to an unknown individual's side.

In the next chapter, Ena accurately surmises that Ashnard will not be "all that upset" if she fails to hold Daein Keep due to him not holding a strong attachment to Daein. Alongside Kasatai, she prepares to engage Ike's army in battle. It is through this battle that Ena's identity as a Dragon Laguz is unveiled after she transforms for the sake of battle. Ena's confidence in her power proves, however, to be unfounded, as she is felled by Ike's forces. She then flees from the throne room with the aid of Nasir, who prevents Ike from chasing after her.