If you're looking for manga similar to Arina, you might like these titles.
In a far and distant future, men and women have become mortal enemies. Each living on seperate planets, an interstellar war is being fought between the two very different peoples. Hibiki, a mere 3rd class worker, finds himself in the middle of a huge space battle, facing the nemesis of mankind: Womankind!
An expansion of the Strike Witches series, World Witches - Contrail of Witches details the short stories of various witches from areas of the European front of the Neuroi War.
The year is 1944, and the war against the Neuroi is over. The 501st Joint Fighter Wing, also known as the Strike Witches, have accomplished their goal of protecting Britannia from the alien invaders. Now that the battle is done, the Witches disband and decide to go their separate ways for some much-needed R&R. As the girls enjoy downtime in the warstricken lands of Gallia and the deserts of Africa, a new danger lurks. A mysterious alien/ human hybrid foretells of another impending invasion. Can the Strike Witches regroup in time to defeat this latest evil threat?
What if World War II had not been a battle between Axis and Allies, but between the human race and mysterious attacking aliens? This is the world of Strike Witches: Maidens in the Sky. The Earth has been invaded by a mysterious alien race known as the "Neuroi." Humanity is on the verge of annihilation and their only hope is a team of flying magical girls--the Strike Witches. Miyafuji Yoshika is a simple farm girl who dreams only of taking over her family's medical clinic. One fateful day, a Strike Witch falls out of the sky and lands right at her feet. Yoshika is a healer and wants nothing to do with warfare or violence, but this chance encounter will change her destiny forever!
Revolves around male college student Mitsuaki Sakugi, who makes his poor living from making figures. One day, he receives putty as a reward from his teacher after sculpting a figure that would be used as a sample in class. That night, after making a figure out of the putty he received, the figure suddenly comes to life. The figure calls herself Reycal, and explains that she is a being called an Orichalcum. She explains that Orichalcum are beings that were born to grant the wish of their maker.
Teru is a boy passionate about the Zoids battle card game. Imagine his excitement when Professor Sonada introduces him to the Zoids battle card game simulator, where the card battles take on a realistic, three-dimensional feel! Now, Teru must learn how to lead his virtual Zoids army into battle and face up to his toughest opponents in the quest to become a worthy commander. One thing is for certain though - his Zoids battle card games will never be the same again!