Raised by her spirit medium grandmother Seiko Ayase after her parents vanished early in life, high school student Momo Ayase endured childhood bullying due to daily spiritual rituals enforced by Seiko for protection. The bullying, which included her crush Jin Enjoji, led to a temporary estrangement from her grandmother. However, Momo eventually recognized her anger was directed at those who mocked Seiko, not the rituals, leading to reconciliation and a strengthened belief in spirits. Momo's personality blends boldness and confidence with a fierce intolerance for injustice, especially bullying, exemplified when she defends classmate Ken Takakura. She is fiercely protective of loved ones, though her volatile temper can lead to outbursts, often followed by remorse if excessive. Underneath her assertiveness, she shows kindness, empathy, and steadfast loyalty, never abandoning those in need. She is easily flustered by romantic feelings and susceptible to flattery. Identifying as a "gyaru," Momo embraces fashion as a core part of her identity, prioritizing personal style and comfort. Momo's journey is shaped by key relationships. She shares a dynamic bond with her grandmother Seiko, mixing affectionate bickering with deep respect and reliance, often seeking her guidance against supernatural threats. Her connection with Ken Takakura, nicknamed "Okarun" after her celebrity crush, starts when she rescues him from bullies. A bet between them on ghosts versus aliens exposes both to supernatural realities, forging a partnership that evolves from camaraderie to romantic tension, characterized by mutual support, jealousy, and unspoken feelings. Rival Aira Shiratori emerges from Momo's jealousy over Aira's interest in Okarun and her initial manipulation of him, though their hostility softens into competitive banter during shared missions. Childhood friend Jin Enjoji, called "Jiji," shares a complex history due to his role in her bullying, leading to situational alliances. Following an alien abduction that triggered traumatic stress, Momo's latent psychic powers awaken. Primarily manifesting as telekinesis visualized as spectral hands, she can manipulate objects, create forcefields, and interact with spirits. Her abilities extend to aura sensing, memory viewing, soul manipulation, and limited curse sealing. Her signature "Moe Moe Tri-Beam" unleashes concentrated energy with spatial manipulation properties, but exhausts her. Momo also possesses exceptional durability, stamina, and endurance, surviving attacks from entities such as the Flatwoods Monster and Acrobatic Silky. Her tactical intellect proves vital in deducing enemy weaknesses, devising environmental traps, and resolving crises like repurposing a defeated entity's remains to stop a volcanic eruption. Momo's development unfolds across multiple arcs. Initially skeptical of aliens despite her belief in spirits, encounters with extraterrestrials expand her supernatural worldview. She evolves from reluctance to proactive acceptance of her psychic heritage, training her abilities under Seiko. Leadership skills emerge as she orchestrates strategies against foes like the Kito Family and coordinates allies during the Byakuja Village crisis. Emotionally, she grapples with jealousy and possessiveness toward Okarun, gradually acknowledging her feelings while navigating rivalries with Aira and later Vamola. Recent events include an accidental size reduction from interdimensional food, requiring restoration by allies.