Shakugan no Shana Wiki
Shakugan no Shana Wiki

"One Reason" (一の理 Hitotsu no ri?) is the twenty-first episode the anime of Shakugan no Shana Final.


Chorde manages to reach the World Egg, and rewrites the Psalm of the Grand Order, instead of destroying the World Egg as expected by Bal Masqué. Enraged, the Snake of the Festival demands an explanation from the Flame Haze on what they have done. Shana and Alastor announce their own plans for the paradise Xanadu, which is to create a law where the Crimson Denizens are not allowed to eat humans anymore. Yūji, and the Snake of the Festival resolve to oppose their interference with all their might, and Yūji orders Sydonay to stop holding back against their opponents.

Sale, and Chiara continue their fight against Mammon, and Dantalion while evading the Seeking Researcher's inventions. The remaining The Four Gods of Earth also continue their battle against their respective opponents despite having achieved their goal, but as Orobas, Leraje, Haborym, and Ribesal will learn, the Four Gods of Earth had another wish than just the law that forbids eating of humans: The wish to kill as many Denizens who have consumed humans as possible to create a taboo against consuming humans for Power of Existence.

Elsewhere, Johann has a talk with Yoshida Kazumi knowing that his life is coming to an end. Because of this, he has formed a plan that will allow him and Pheles to continue on in another form. He also has a message for Wilhelmina Carmel from him and Pheles. Kazumi wakes up in the back of the Hyakki Yakō van, revealing that her conversation with Johann was not held in the real world.

While back at the Star of Darkness Castle that has been turned into the towering Saishuku no Shadan, Dantalion unleashes an experiment of terrible powers upon Sale, and Chiara.

Back at the Hyakki Yakō van speeding through the streets, Para discovers that he is no longer in control after Pirsoyn deploys his unique Unrestricted Spell upon them. They speed up the embankment around the Star of Darkness Castle, and find themselves mid-air just as an army of Servant cannons, and Denizen's open fire upon them. It would seem they have run out of luck, and high above them Yūji, and Shana witness the van exploding...

Characters in Order of Appearance[]

* denotes if the character debuts in this episode

Powers and Abilities Used[]

Unrestricted Spells[]

Treasure Tools[]






Cultural References[]

Animation Trivia[]

  • Near the end of the previous episode, Sydonay watches the Chorde rings hit the World Egg while being restrained by Wilhelmina's ribbons and in his base form. When he views the same event in this episode, he is not restrained and in Manticore form, rushing to Hecate straight afterwards.




Shakugan no Shanalist of episodes The End of Everything, The Beginning of One ThingThe Lit FlameThe Torch and the Flame HazeThe Confused Flame HazeRespective ThoughtsComplication, Activation, ConfrontationThe Two Flame HazeThe Beautiful GobletThe Poolside of Love and DesireEntangled FeelingsYūji, Shana, and KissesFlowers Bloom in the CradleDeclaration of War Behind the SchoolA Great PersonThe Day the Flame Was BornThe Flame-Haired, Burning-Eyed HunterA New ChapterA Shattering WishInside the BattleHeartless WilhelminaDiverging FeelingsThe Flickering FlameBattle at the SeireidenCrimson ThoughtsShakugan no Shana Special: Love and Outdoor Hot Spring Tutorial!
Shakugan no Shana The Movie
Shakugan no Shana Secondlist of episodes The Second TimeThe Beginning of EverythingThe Suspicious Transfer StudentThe Anxious GirlsThe Family's Dinner TableEve of TroubleHayato Ike, a Day of GloryThe Door to the PastThe Milestone of SorrowThe Man Who ReturnedThe Promised PairThe Clear Autumn Festival BeginsConvergence, Then a SignEternal LoverAwakeningCeaseless FeelingsRespective PathsThe Intricate YūjiMatters That Could Not Be SaidMadder Red Struggle to the DeathCombined StrengthChristmas EveQuickening PerilThat Which Must Be Protected
Shakugan no Shana Slist of episodes ReshuffleDomicileOverture (Part 1)Overture (Part 2)
Shakugan no Shana Finallist of episodes Lost ExistenceWhat Must ComeTo Start the JourneyReunions and EncountersCaptured Flame HazeIn the Palm of Their HandsThe Divine GateBeginning of the WarTo SeireidenCrossingFeelings HeardThe Words of an OathFrom Rift to RiftDeclaration of the Grand OrderRout in the RainTo Battle, Once MoreFor Whose Sake?Maelstrom of WarfareWhat the Wind CallsThe World EggOne ReasonDream of the StrangerThe God's DreamThe End in the Distance