Lailah Justina, mother of Emilia Justina and wife of Nord Justina, descends from archangel lineage. Her influence shaped pivotal events across Ente Isla and Earth when she supplied Emerada and Albert with a quill crafted from an angel’s feather, bypassing the need for the sacred sword to traverse interdimensional gates. This artifact became instrumental in enabling key figures, including Emi, to move freely between worlds.

In her youth, Lailah intervened to save Sadao Maou from mortal peril after glimpsing his emotional fragility. This encounter spurred her to share insights about Earth and bestow upon him a seed-like fragment of Sephiroth. Planted in the demon realm, the fragment matured into Alas Ramus—a child-like embodiment of Yesod, a vital facet of the Tree of Life. By later channeling the fragment through a gate to Earth, Lailah orchestrated Alas Ramus’s emergence in Maou’s dwelling, inadvertently forging a parental bond between Maou and Emi.

Her maneuvers attracted scrutiny from angelic entities like Gabriel, who pursued the Yesod fragment to restore cosmic equilibrium. Lailah’s covert aid resurfaced during a clash at an amusement park, where she momentarily eased Alas Ramus’s suffering. Though her intentions remained opaque, this act revealed her enduring, if subtle, involvement in unfolding events.

Emi’s hybrid abilities, including her mastery of a holy sword housing a separate Yesod fragment, stem from Lailah’s dual heritage. The archangel’s legacy further entwined with cosmic strife through her guardianship of Acieth Alla, another Yesod fragment.

While absent from direct conflicts, Lailah’s strategic hand echoed through her indirect interventions—ensuring Maou’s survival, steering key alliances, and subtly shaping the balance between realms. Her enigmatic methods underscored a calculated commitment to preserving stability, leaving allies and adversaries alike to decipher the depths of her foresight.