Web manga spinoff of Upotte!!

From TJO:

The Kingdom of Granza is steadily building up their power and expanding their realm. Fleeing from their 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, Faana somehow manages to travel several kilometers to the Kingdom of Cordeaa, where she passes out at a lake. Upon awakening 3 days later, she is surprised to find herself inside the castle of King Yogufu, the ruler of Cordeaa. Faana is even more surprised when she meets his daughter, Princess Orfina—the two girls are identical strangers.

The two become fast friends, but this happiness is soon overshadowed as Granza advances its campaign into Cordeaa...

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 M16s and realizes that he has come to an unbelievable school. How will his experience be at Seishou Academy?

Note: Chapter 9 technically doesn't exist, it was skipped when "Upotte! Nano" switched publications from Young Ace to Shōnen Ace.

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 motion 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...

From TJo:

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.

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 M16s and realizes that he has come to an unbelievable school. How will his experience be at Seishou Academy?