Celistia Arc

Celistia Arc is the third story arc of Saijaku Muhai no Bahamut series. This arc highlights Celistia Ralgris, one of the Royal Officer Academy's strongest knights and a daughter of one of the Four Great Nobles, who strongly opposes Lux's enrollment in the academy.

A View Of the Hero
Somewhere from the skies, Fugil and a woman named Mishis V Xfer are watching the world via a floating airship where Mishis asks Fugil's decision on entrusting the Divine Drag-Ride to his future rival that will eventually fight against him. As his answer, Fugil then asks back to Mishis about the definition as a Hero, of which she answers as someone who fight for the sake of justice tone. Fugil however denies as he claims the drive for some people willing to be Heroes are their self-preservation and in order to open the Ruins for themselves, these Heroes are needed as their key.

School Life and Her Speculations
On the noon, Lisha flirts with Lux. suddenly, Krulcifer also comes and flirts with him. Because Lisha is uneasy and jealous after a week "Lux ownership", Lisha expulses her.

Lux is leisurely staying in his room. Then, a girl is knocking the door noisely. Lux opens the door and lets her talk. She directly conveys that Celistia Ralgris is back. Lux hurries up come in Headmaster's room. Two blondes haired, Lisesharte and Celistia are debating so loud while on the door, the girls are looking onto their debate. Lux enters the room. Headmaster is slightly happy to see Lux already being here. Lisha does not lose to argue that Lux is the exception to enroll Royal Officer Academy and Celistia argues exception does not apply for males to enter women school. When Lux can speaks his mind, he also argues to enroll here to defeat Ragnaroks so he will not accept to be dismissed. Celistia does not know there will be a mission to subjugate Ragnaroks. She also speaks to defeat the Ragnaroks by herself. Lux who cannot be convinced also argues. Relie then speaks the freshman and second year will fight against third year to settle this from ability for, only the winner to secure their wish. Lux's side will demand Lux to stay in and include him in Ragnaroks subjugation whereas Celistia's side's demand  is Lux's expulsion immediately. The battle will be held three days later at "campus selection battle".

Anime

 * Some of the scene from Ries Island Arc are mixed into this arc.
 * The scene between Fugil and Mishis is omitted out from the anime series.
 * The duel itself is altered in the anime series where some of the scenes in the Light Novel did not appears in the anime. Also, if Lux will stay or not is settled by tag team and duel between Lux's side (first year and second year) vs Celistia's side (third year). A point system for the winner is used.
 * Lisha and Krulcifer did not battle against Celis before Lux and Philuffy.
 * The beach scene, which was originated from the fourth arc, is added into the anime's seventh episode before the duel between Lux and Celis.
 * Saniya did not reveals her true identity as one of Heiburg Republic's spies to anyone even Celis. In fact, rather than Airi who notice Saniya's true nature in the Light Novel series, Shalice and Tillfur are the one who discover Saniya's betrayal instead.
 * Philuffy simply disappears from the crowd without battling against Hayes or other Heiburg Republic spies.

Major characters

 * Celistia Ralgris
 * Saniya Lemiste
 * Lux Arcadia
 * Hayes Vi Arcadia
 * Lisesharte Atismata
 * Philuffy Aingram
 * Krulcifer Einfolk

Supporting characters

 * Relie Aingram
 * Airi Arcadia
 * Shalice Baltshift
 * Tillfur Lilmit
 * Wade Roadbelt (Posthumous)

Minor Character

 * Fugil Arcadia
 * Mishis V Xfer

Story Impact
Lux's and Celis's first battle against a Ragnarok gives a drastic change to those who involved, along with appearances of Heiburg Republic's members such as Hayes and Saniya whose goal is to destroy the New Kingdom.
 * Behind her infamous reputation being a "man-hater" masks Celis's own shyness in interacting with men other from her father, nor did she have any knowledge about them. That remained secret and they are only known by Saniya and Lux (as "Luno").
 * Celis's protest against Lux's enrollment as Royal Officer Academy's student is explained as her redemption to protect Lux from anything related to the Old Empire out of her respect to late mentor Wade Roadbelt, who happens to be Lux's grandfather from his mother's side.
 * Following her betrayal, Saniya is no longer affiliate with New Kingdom of Atismata, making her as Lux's and his friends' enemy until the Empire Recapture Plan in fifth arc.
 * New Kingdom is on guard against Heiburg which doesn't reply properly and clearly. This matter continues until the death of the King of Vices Calensia Hersmice whom establish military regime along with Hayes.
 * Hayes is introduced as this arc's main antagonist who is responsible for Poseidon's attack during Celis's and Lux's mock duel. The first meeting between the two would foretell their fierce rivalry where she yield a strong antagonistic hatred against Lux for she deems him as a "Fake Prince".
 * Celis begin to open herself to Lux after seeing his identity as the Black Hero, resulting their reconciliation after she recognizes the former prince as the Royal Officer Academy's student.
 * In fact, since Lux is the first man in her life to praise her, Celis becomes one of Lux's important allies and later becomes one of his love interest in the later arcs.

Trivia
(To be added...)