Shakugan no Shana Second Episode 21
Combined Strength
Second ep 21
Name in Japanese 合わさる力
Rōmaji Translation Awaseru Chikara
Release Date March 7, 2008
Production Staff
Screenplay Seishi Minakami
Storyboard Yoshitomo Yonetani
Episode Director Daisuke Takashima
Episode Navigation
Previous Shakugan no Shana Second Episode 20
Next Shakugan no Shana Second Episode 22
Theme Songs
Opening Blaze by KOTOKO
Insert Joint by Kawada Mami
Ending Sociometry by KOTOKO

Combined Strength (合わさる力 Awaseru Chikara?) is the twenty-first episode of the anime series Shakugan no Shana Second.


Characters in Order of ApperanceEdit

* denotes if the character debuts in this episode

Powers and Abilities UsedEdit

Unrestricted SpellsEdit

Treasure ToolsEdit






Cultural ReferencesEdit

Animation TriviaEdit

TV and Blu-ray differencesEdit

  • The next episode preview of the TV version shows the title "Christmas Eve" as クリスマス・イブ instead of the correct クリスマス・イヴ. This was fixed in the Blu-ray version.



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