Nanaka, affiliated with the Twilight Caravan guild, is a short young woman distinguished by long, curly purple hair tied into two knee-length pigtails and bright purple eyes. Her personality revolves around a deep passion for anime, manga, and video games, often infusing her online chats with terms like "Kirekore" and manga sound effects. A defining habit sees her conducting "Regular Patrols" while clutching a dakimakura, frequenting bookstores and game shops, with a pronounced fondness for magical girl media.

Within the game, Nanaka chooses the wizard class for its magical girl resemblance, despite craving the frontline melee combat typical of the genre. This class limitation requires her to partner with the player character. In battle, she employs a strategic method termed "Devise Guard Reinforcement Magic and Turn Into an Offensive Attack." Her history includes a long acquaintance with the player character, tracing back to their primary school days where both earned recognition as "hardcore gamers."

A summer variant of Nanaka is available via permanent gacha. This version unleashes a Union Burst dealing large magic damage to enemies within range while slightly reducing their magic defense.

Her name, Nanaka, combines the Japanese characters for "seven" (七) and "fragrance" (香). Her surname, Tanno, translates to "rust-colored field." A notable piece of trivia is her routine of performing patrols with her dakimakura.