Sohara Mitsuki serves as the narrative’s emotional anchor, rooted in her history as the male protagonist’s childhood friend. Living directly across the street, she maintains their childhood ritual of waking him each morning—a habit forged during years of companionship. Her early years were shadowed by prolonged illness and isolation, with the protagonist as her only solace. A defining childhood memory involves his birthday gift of orange seeds and a shared cake, which she credits as the catalyst for her enduring bond and unspoken romantic attachment. Her demeanor juxtaposes genuine warmth with a fiery temper, particularly when provoked by the protagonist’s lewd antics, met with exaggerated karate strikes. This combative reflex stems from a childhood "Spartan training" mishap, where his encouragement to defend herself inadvertently cemented their dynamic of physical humor. Beneath her aggressive exterior lies unspoken affection, occasionally manifesting in daydreams of romantic closeness, though she vehemently denies these fantasies if confronted. Physically, she embodies a teenage girl with long chestnut hair often secured in a ponytail, brown eyes, and a figure noted for its proportions (93-59-84 cm). Subtle variations exist between manga and anime portrayals, particularly in bust size and eye shade. A climactic revelation exposes her as a clone engineered by Daedalus, an angelic Synapse entity. The original Sohara succumbed to her fragile health, her existence erased from memory. The clone, designed to preserve the protagonist’s recollection of their bond, clarifies narrative mysteries—his visceral reactions to Synapse symbols and her revival after Chaos temporarily erased her. Her relationships balance jealousy toward angeloids close to the protagonist with genuine camaraderie. A stranded-island ordeal strips away her usual brashness, revealing cooperative vulnerability and mutual romantic undertones. Quirks include disastrous cooking—epitomized by a toxic fried egg—and an inability to swim, necessitating rescue. Language-based humor emerges in dubs through her mangled pronunciation of "apple." Her arc navigates identity, loyalty, and concealed longing, positioning her as pivotal to resolving Synapse-related conflicts and angeloid autonomy. The tension between her human fragility and engineered origins amplifies her role as a bridge between ordinary life and celestial intrigue.