Misumi "Mito" Tozawa originates from the Sword Art Online Progressive series, specifically the "Aria of a Starless Night" story. Her prior experience as a Sword Art Online beta tester equips her with advanced knowledge of game mechanics and early progression strategies, positioning her to guide new players unfamiliar with the game's systems. Mito shares a significant relationship with Asuna Yuuki, whom she knew from their school life before the game's launch. Shortly after players become trapped in the death game, Mito actively seeks out Asuna. Recognizing Asuna's lack of gaming experience, Mito assumes a protective and instructive role, providing essential equipment including a rare Wind Fleuret rapier and teaching fundamental combat skills for survival in Aincrad. Their initial partnership centers on mutual reliance and shared objectives in navigating the game's challenges. Mito's beta tester knowledge proves vital during the first-floor boss battle against Illfang the Kobold Lord. She participates alongside Asuna and Kirito. In a critical phase of the fight, she intervenes to protect Asuna from a potentially fatal attack, showcasing her commitment to Asuna's survival despite the risks of confronting a floor boss. Following the successful boss battle, a significant shift occurs. Mito confesses her personal motivations and emotional burden: she intentionally encouraged Asuna to play Sword Art Online despite knowing Asuna's initial reluctance, driven by her own desire not to face the game alone. Consumed by guilt over potentially endangering Asuna, Mito withdraws from their partnership. She leaves Asuna to progress through Aincrad independently, believing this separation necessary for Asuna's safety and emotional well-being. This separation marks a pivotal moment in both characters' trajectories within the game.