Kämpfer is a Japanese light novel series by Toshihiko Tsukiji, with illustrations by Senmu. The series contains 15 volumes published by Media Factory under their MF Bunko J imprint between November 2006 and March 2010. The main series covers 12 volumes, while the remaining three are short story collections. A manga adaptation by Yu Tachibana started serialization in the April 2008 issue of Monthly Comic Alive. A 12-episode anime adaptation aired in Japan between October and December 2009 on TBS, concluded in spring 2011 with Kämpfer für die Liebe. The series has extensive use of the German language.

Tomoko Konagai is a first-year in high school and a shy girl. Tomoko owns three cats. The cheerful and live Munchkin Maa, the smart and responsible Russian Blue Rou, and the gentle crybaby Singapura Shii. Tomoko, whose only friends were her cats, one day becomes friends with Azumi Shiratori, who also loves cats.

A terminally ill girl named Himari Takakura is miraculously saved from death by a strange spirit who resides in a penguin-shaped hat. However, in exchange for extending her life, the spirit tasks Himari's brothers, Kanba and Shōma, to seek out an elusive item known as the Penguin Drum with assistance from a trio of strange penguins.

The fleeting and sad story about little girls known as fairy weapons and an associate hero that survived. This is a world after it was attacked by unidentified monsters known as beasts and many of the species in the world, including humans, had been destroyed. The species that had managed to survived left the ground and were living on a floating island called Regal Ele. Willem Kmetsch wakes up above the clouds 500 years later and couldn’t protect the ones who he wanted to protect. Actually, he was living in despair because he was the only survivor.

Jashin-chan, a devil from Hell was abruptly summoned to the human world by Yurine Hanazono, a stoic college student who lives in a run-down apartment in Jinbocho. They're forced to become roommates since Yurine doesn't know how to send Jashin-chan back. But according to Jashin-chan, she could return by killing Yurine, so she takes action...?! A viperous roomie comedy that keeps you on your toes!

Suzuka Nagami is a beautiful third-year middle school student who has excellent grades and is the student council president. She wrote a novel about a little sister who dotes on her older brother, and the novel wins a light novel award. After they discuss the matter, Yuu is the one who debuts as a proxy light novel author instead of Suzuka, under the pen name Chikai Towano.

Akira Oono is an ordinary working adult who manages the MMORPG Infinity Game. Fifteen years after creating the game, Oono decides to shut the servers down once and for all. However, as the clock strikes midnight, he somehow finds himself in the body of middle-aged Hakuto Kunai, Infinity Game's Demon Lord! Soon after his mysterious transportation, he witnesses the demon Greole chasing after a little girl named Aku. Although he effortlessly dispatches the creature, Hakuto is still concerned; after all, he does not remember creating the girl or the demon! Doubting whether he truly is in the world of his creation, Hakuto decides to investigate. Bringing Aku along as his guide and companion, Hakuto sets out on a journey to find out exactly who or what summoned him to this fantasy world—all while leaving chaos and destruction in his wake.

“Clank, clank, clank, clank...” Today, the railroad crossing bar goes down again, stopping someone on their way somewhere. The various stories of youth, eros, art, first love, etc that occur during the time spent waiting at a railroad crossing... All railroad crossings, all the time. Bringing you a variety of short stories about railroad crossings!

Nao Takanashi loves her brother Shūsuke despite the incest taboo. Nao thinks that Shūsuke is her blood relative, but in fact she is an adopted daughter, whose parents have died. After Nao learns the fact, she wants to fall in love normally with Shūsuke because siblings by adoption can marry under the family law in Japan. However, she finds herself competing with Shūsuke's childhood friend, Iroha Tsuchiura, and his class president and yaoi lover, Mayuka Kondō.

Kojou Akatsuki's days as an ordinary high school student in the Demon District of Itogami Island come to an abrupt end after a fateful encounter leaves him with the remarkable abilities of a vampire. It isn't long before he is thrust into the center of attention when it is discovered that he is the fourth primogenitor, an immensely powerful vampire whom most consider to be merely a legend. Fearing Kojou's destructive potential, the Lion King Organization sends in an apprentice sword-shaman, Yukina Himeragi, to monitor, and should he become a threat, kill the boy deemed the world's most powerful vampire. Forced together by circumstance, the two form an unlikely alliance as Kojou comes to terms with his abilities and they both struggle to protect the city from various emerging chaotic forces.

Kojou Akatsuki's days as an ordinary high school student in the Demon District of Itogami Island come to an abrupt end after a fateful encounter leaves him with the remarkable abilities of a vampire. It isn't long before he is thrust into the center of attention when it is discovered that he is the fourth primogenitor, an immensely powerful vampire whom most consider to be merely a legend. Fearing Kojou's destructive potential, the Lion King Organization sends in an apprentice sword-shaman, Yukina Himeragi, to monitor, and should he become a threat, kill the boy deemed the world's most powerful vampire. Forced together by circumstance, the two form an unlikely alliance as Kojou comes to terms with his abilities and they both struggle to protect the city from various emerging chaotic forces.

Kojou Akatsuki's days as an ordinary high school student in the Demon District of Itogami Island come to an abrupt end after a fateful encounter leaves him with the remarkable abilities of a vampire. It isn't long before he is thrust into the center of attention when it is discovered that he is the fourth primogenitor, an immensely powerful vampire whom most consider to be merely a legend. Fearing Kojou's destructive potential, the Lion King Organization sends in an apprentice sword-shaman, Yukina Himeragi, to monitor, and should he become a threat, kill the boy deemed the world's most powerful vampire. Forced together by circumstance, the two form an unlikely alliance as Kojou comes to terms with his abilities and they both struggle to protect the city from various emerging chaotic forces.

The story revolves around a new team of "Toei robot girls" named "Team Z" that is made up of three girls based on Toei's Mazinger Z franchise: Mazinger Z, Great Mazinger, and UFO Robot Grendizer. Usually they perform in activities around Nerima ward in Tokyo to raise the awareness of the promising future energy source "Photon Power" (koushiryoku). However, there are times when "Mechanical Beast" team of girls emerge from the "Subterranean Empire" and attempt to steal the energy. Thus "Team Z" has to battle them to prevent this, though sometimes they just go and beat up the "bad girls" to relieve stress.

In the popular MMORPG world 'Union' there existed a legendary party named Subaru. This party, made up of a group of childhood friends and elementary schoolers, exceeded the limits of the game with their various senses. However, due to an incident which resulted in a death, 'Union' ended its service and the group of childhood friends went separate ways. Six years later, highschooler Haruto logged into the new 'Reunion' and reunited with a single girl. Asahi—one of old 'Subaru' party members, and his childhood friend who should have died six years ago. Is she a digital ghost, or...?