Tennouji Kitsune

Doujinshi by the author of the official work. Short side stories that might fit chronologically in the main series.

Web manga spinoff of Upotte!!

Doujinshi written by Tennouji Kitsune and published at comiket, centered around side characters from the main series.

In a parallel 21st century Japan, an enemy with incredibly advanced technology attacks mainland Japan from Hokkaido, shattering the Japanese Defense Forces and their American allies. Japanese military scientists use what enemy technology their troops can capture to create their own mecha to fight off the enemy's advance. But what does this have to do with a boy named Yuu, a mechanical genius with motor sickness, and his separation from his younger sister for over 7 years? Why does she suddenly appear after all that time, dressed as a miko and shadowed by a fox, at the temple where Yuu lives with his uncle? Is she who she says she is? She reappears in his life just as military secrets and his own secret burden of a psychic power shake up his socially estranged life. And then the war advances…

Upotte!! 4-Koma Note: Chapter 9 technically doesn't exist, it was skipped when "Upotte! Nano" switched publications from Young Ace to Shōnen Ace. Cancelled due to parent magazine folding.

A teacher is looking for a school by the name of Seishou Academy, as he is a new transfer teacher for that school. Seishou Academy is known for having students with excellent marksmanship. However, he gets lost along the way and decides to look for someone who knows where the school is at a summer festival. He encounters a girl at a shooting range and finds her marksmanship skills to be professional. The girl tells the new teacher that she is an assault rifle, not a student. Her name is FNC and is an assault rifle of Seishou Academy. The new teacher attends school the next day to find students, including FNC, practicing shooting assault rifles and realizes that he has come to an unbelievable school. How will his experience be at Seishou Academy? Note: Chapter 20 technically doesn't exist, it was skipped when "Upotte!" switched publications from Young Ace to Shounen Ace.

Continuing on where the original series left off, it's back to character ATTRITION as familiar and endearing characters are revived and summarily executed in a race to put an end to the Granza-Cordea War. Having lost Shisun at the end of the original series, Faana (aka Princess Orfina) was left traumatised and demoralised by the scale of the conflict. Everything and everyone she loved and held dear had been lost during the assault on Fort Malga. The few friends and allies Orfina had pulled her out of the broken fortress and placed her in the care of a nearby convent where she assumed the role of Sister Maria. What will become of the Granza-Cordea Conflict? What solution would Orfina use to end this bloody and attrocious war?

In a world with floating cities know as Eden, a young boy named Jorrne attempts to return to Eden to be reunited with his mother. Born with the destiny of bearing god-killing powers, he is the object of Eden's attention–both as something to study, and something to destroy. Aided by a young magic-wielding girl named Elisiss, her sister Enefeaa, and a swordsman sent from Eden, Jorrne travels to find his way home and to discover the truth behind his power.

The Kingdom of Granza is steadily building up its power and expanding its realm. Fleeing from the attack on her home, Faana and her companions hide in the woods, hoping to escape from the Granza Military. However, as her group is hunted down, Faana is the only one fortunate enough to escape alive. Half-dead, she somehow manages to travel several kilometers to the Kingdom of Cordeaa, where she passes out in a lake. Upon awakening three days later, she is surprised to find herself inside the castle of King Yogufu, the ruler of Cordeaa. Faana is even more surprised though, when she meets his daughter, Princess Orfina - the two girls are identical strangers. The two become fast friends, but this period of happiness doesn't last long as Granza soon advances its power into Cordeaa…

A famous game romance action RPG "Dungeon Academia". In that famous world of "game to the death," I reincarnated as a mob with the worst job possible: "Healer. " My fate was dying right away... However... I'll use my knowledge from grinding this game for days on end in my previous life to overturn that fate. A reincarnation fantasy, where healing is turned into a weapon to fashion a meteoric rise to the strongest in the world.

"Dungeon Academia,” a famous romance action RPG known as a brutal death game. Allen Claude is reincarnated into that world as a mere mob character with the worst possible job: Healer. If nothing changes, an instant death route awaits him. However, armed with the game knowledge he mastered in his previous life, Allen decides to defy fate itself. By turning healing magic into a weapon, the weakest mob begins his rise toward becoming the strongest in the world in this otherworldly reversal fantasy!

In the manga's story, humanity fought against divine beings in a secret war for its existence seven years ago. A girl named Waka, as well as her companions became Valkyries chosen by the gods and gave their lives to end the battle. In time, Waka's younger sister Kiko grows up and enters high school. But now the divine beings have returned.