Moena Wakakusa is a member of the HxEros team based in the Tokyo branch, introduced as a supporting character in the series. She is a high school student who attended the same middle school as Momoka Momozono, though Momoka is particular about the phrasing of that connection. Moena consistently wears a surgical mask and is described as a downtrodden or apathetic type of girl, often appearing subdued and lacking in outward energy. Her HxEros device is located on her left hairpin, which she uses to channel her abilities in combat against the Censor Bugs. Her primary motivation aligns with the broader HxEros mission to protect humanity from these alien threats, but her personal drive and deeper ambitions are not prominently explored in the story. Her most notable relationship is with Momoka, their past school connection providing a basis for interaction within the team. Moena does not undergo significant character development over the course of the narrative, remaining a relatively quiet and consistent presence. Her notable ability is her function as an HxEros member, implying the capacity to generate and utilize H-energy through her device, though specific combat techniques or unique powers are not elaborately detailed.