Yuna Saionji competes in the DELUXE tournament, a battle to crown the strongest fighter, facing formidable opponents like Akina Myodo, Kagetsu Yakumo, and Suo Yobitsugi. She is known for her strength as a player in Net Vanguard. A defining aspect of her character is her intense admiration for the supreme idol "Mi-tan" (also called Makoto); this deep fandom fuels a significant personal wish. It manifests visibly through her ownership of extensive Makoto merchandise.

Beyond the arena, her daily life reveals relatable, relaxed habits, such as lying down while absorbed in her phone, reflecting an everyday lifestyle distinct from tournament intensity. Her connection to Vanguard seamlessly integrates into these routine activities.