''Mahou Sensou'' (魔法戦争 / ''Magical Warfare'') is a LightNovel series by author Hisashi Suzuki with characters designed by Lunalia.

The story revolves around Takeshi Nanase, who--his rather dysfunctional family aside--is an OrdinaryHighSchoolStudent. His life changes completely when a mysterious girl named Mui Aiba collapses in front of him on his school grounds. She turns out to be a magician from another world and she is involved in a conflict against a group known as Ghost Trailer.

A manga adaptation by You Ibuki has been serialized by Monthly Comic Gene since April 2013, and the {{tankobon}}s are available as English ebooks through Kadokawa's Book Walker service. A one-cour anime adaptation by {{Creator/Madhouse}} aired during [[Winter2014Anime winter of 2014]], was simulcast by Website/{{Crunchyroll}} and is available on Blu-ray and DVD from Creator/SentaiFilmworks.

!!''Mahou Sensou'' provides examples of these tropes:

* AcademyOfAdventure: Subaru Magical Academy. As you might have expected, our hero, his girlfriend, and another friend transfer there.
* AccidentalKiss: Mui and Takeshi received their first kiss from each other in this fashion. Kurumi is not pleased when she finds out.
* BecomingTheMask: Isoshima's relationship with Takeshi started as just an act to drive off stalkers but by the series' beginning she's in love with him for real.
* BreastExpansion: How Isoshima discovers that she is a magician; her first transformation is here.
* CombatClairvoyance: Takeshi's power is "Evasive Magic".
* EasyComeEasyGo: The only thing necessary to obtain magic for an adolescent is to come in direct contact with magic. The only thing necessary to lose magic is to use it directly against another magic user in the real world. Although it was heavily implied that, should a magic-using adult lose their magic, it will be lost for good.
* GainaxEnding: The anime ends with [[spoiler: Takeshi and Gekkou getting caught in a massive magic explosion, and Takeshi apparently waking up at Subaru ''in 1998'']].
* ImprovisedWeapon: The only weapon Takeshi can find to fend off the attacking Ghost Trailer members is a {{broom|stickQuarterstaff}}. Averted in the anime as he has a ''shinai'' with him at that time.
* LeftHanging: Pretty much every plot twist in the entire show. Takeshi's mother using a ring that amplifies her powers but drains her life force in order to train him? Never brought up again. Wizard Brace being accused of [[WitchHunt historical war crimes?]] Never brought up again. [[spoiler:Ida's sister]] being kidnapped by the freaking magical FBI? Never brought up again!
* LoveTriangle: Both Kurumi and Mui have feelings for Takeshi. The pretend relationship between Kurumi and Takeshi adds a wrinkle.
* MeetCute: Takeshi and Mui's first meeting is him finding her passed out on school grounds.
* NamedWeapons: Takeshi's sword is known as "Twilight." He also gives its consciousness a more personal name, "Towa."
* PlayingWithFire: Ida's power is centered around using fire.
* RoaringRampageOfRevenge: Takeshi gets pissed when Gekkou's attack [[spoiler:almost kills Kurumi]], his powers reach new heights, and he starts decisively beating Gekkou in his berserker rage.
* SayMyName: Takeshi does this quite frequently. Taken UpToEleven in the finale where practically ''every other word out of his mouth'' is someone else's name, usually "Gekkou".
* SkewedPriorities: In the first episode, Isoshima is more concerned with her pretend-boyfriend calling a girl she doesn't know by her first name than she is with the muscle-bound lunatic with a massive sword who's attacking them.
* TalkingIsAFreeAction: Mui gives a big info dump in the first episode while she's sitting down talking with Takeshi. The people chasing them don't catch up until she's finished.
* ThemeNaming: The major characters have kanji {{numer|icalThemeNaming}}als in their names:
** Nanase (七瀬) has 七 (seven).
** Mui is written as 六 (six).
** Isoshima (五十島) has 五 (five) and 十 (ten) (when put together as 五十, it's "fifty").
** Kazumi (一三) has 一 (one) and 三 (three).
** Tsuganashi is written as 十 (ten).
** Shijou (四条) has 四 (four).
* TouchedByVorlons: This is how all magicians gain magic; they came into contact with magic from another magician. Takeshi, Kurumi, Kazumi and Futaba all get magical powers after being attacked or accidentally attacked by magicians. In the manga, Gekkou claims he gained his powers by touching the mirror Kurumi used to portal back home.
* TwoGuysAndAGirl: Takeshi, Ida, and Kurumi with the usual issues of friendship and rivalry.
* WeUsedToBeFriends: Momoka and Washizu were school friends.
* WhatHappenedToTheMouse: Among other questions the anime leaves unanswered: what happened to Ida's sister, who was [[spoiler:taken by Wizard Brace's secret service]]?
* WholePlotReference:
** A BigBad who leads a faction full of magic-wielding supremacists with the goal of conquering [[{{Muggles}} non-magical people]], then suddenly disappears for more than ten years, awaiting his revival? Sounds a lot like [[Franchise/HarryPotter Lord Voldemort]].
** A subset of humanity with fantastic powers fearing persecution. One faction wants to live peacefully with norms, the other wishes to dominate them. [[ComicBook/XMen Where have we heard this before?]]