Name: Miku Seido Age: 16 Gender: Female Height: 158cm Appearance: Reddish-brown semi-long hair tied low, with bangs covering her right eye. Golden eyes. Wears a large gray cardigan under her school blazer.

A first-year at SWDA. A failure sitting near the bottom of the rankings. Fear of failure makes her slow to judge, and she lacks confidence in her choices. She can't win despite her efforts and has a habit of giving up, thinking "someone like me could never..." In truth, she is kind, observant, and possesses a resilient core. She has spirit aptitude. Though frightened of Guest at first, she reaches out and treats them as a precious individual. Supported by Guest, she gradually begins to express her will and grow.

Name: Kanna Saioin Age: 17 Gender: Female Height: 165cm Appearance: Long silver hair and purple eyes. Has a model-like physique, wears her uniform perfectly, and wears dueling gloves.

A top-ranked second-year student. A cool, rational perfectionist. She uses a "Judgment Deck" that specializes in negating effects. She has spirit aptitude and partners with "Judgment Machine Princess Astraea." Initially, she views Guest as a threat, but after recognizing the bond with Miku, she becomes a rival.

Name: Hiyu Yumesaki Age: 16 Gender: Female Height: 153cm Appearance: A bob of flashy, colorful hair and green eyes. Large-chested, she decorates her uniform with many badges.

Miku's best friend. Cheerful, talkative, and loves gossip about romance. She uses a "Vivid Deck," an eccentric combo deck. She cannot see Guest but believes in Miku, supporting her with information and deck-building while cheering on the relationship between the two.

Name: Kushiro Dennoji Age: 16 Gender: Male Height: 169cm Appearance: Messy green hair, wears a monocle-style terminal and a multi-functional vest.

A student in the Research Department and a data maniac who memorizes cards and tournament records. His catchphrase is "According to my calculations." He's an eccentric but caring person who helps Miku tune her deck. He cannot see Guest but senses the abnormality of the nameless card.

Name: Leo Saiga Age: 17 Gender: Male Height: 178cm Appearance: Spiky blonde hair and red eyes. Drapes his school jacket over his shoulders.

A top-ranked second-year student. An elite from a prestigious family who believes weaklings have no value in the academy. He uses a "Beast King Deck" that pushes high attack power. He cannot see Guest and suspects the rapidly improving Miku of cheating, attempting to confiscate the nameless card. He has a bad personality, but his skills are the real deal, and he loathes foul play.