If you're looking for anime similar to Strike Witches: CHIi Size, you might like these titles.
Gonzo does it again with this action-packed mecha comedy. She's an ordinary high school girl. He's a counterterror agent assigned to protect her from those who would steal the information locked in her mind. OK, so she's not so normal after all. Armored Slave battles and lovers' spats abound as Sousuke and his comrades try to track down the mysterious Gauln before it's too late.
Many months have passed and the spring season is almost upon them. The “irregular” elder brother Tatsuya and his smart younger sister Miyuki realize that their first year at Magic High School is about to come to a close. The siblings and their friends decide to spend spring break at a private villa on Ogasawara Island. Tatsuya and the others make the most of their brief vacation until a young girl named Kokoa appears before them. The mysterious young girl who escaped from a naval base tells Tatsuya her one wish...
The year is 20XX. Reploids - thinking robots based on the design of 'Megaman X' - work side by side with humans in relative harmony. Rogue reploids, which are prone to becoming violent for no reason, are generally few and far between; however, an abnormal rise in 'rogue' activity has now swept the city and only two elite Maverick Hunters can save the day - the dynamic duo, X and Zero! As their investigation continues and rogue activity increases, X and Zero can't help but feel they are being deliberately misled. With time running out and rogue reploids on the verge of destroying the city, can our heroes track down and thwart the villain before it is too late?
Morale matters just as much as launching a counterassault. Instead of standing on the front lines with the 501st Joint Fighter Wing, the Luminous Witches of the League of Nations Air Force bring smiles to civilians displaced in the human-Neuroi war.
In the year 2000, humanity has advanced rapidly in terms of technology, with inventions such as the G-Reactive engine allowing aircraft to move at never-before-seen speeds. However, all is not well and every vehicle to have used this new technology has disappeared on its maiden voyage, following the arrival of a group of rainbow lights. Eager to solve the mystery behind this is a young man named Penny Carter who soon enlists the help of genius teenager Billy Kimura, owner of the company that makes the G-Reactive engine. However, they soon discover the cause to be UFOs, which threaten the Earth's very safety! Now, they must combat this extraterrestrial foe, understand it, and find out exactly who's behind the situation before it’s too late...
Solar calendar year 2020: grotesque organisms called Others have begun eating people. To take down this new enemy, the Other Suppression Force is formed. Saved by this elite team as a child, psychokinetic Yuito withstands the training to enlist. On the other hand, prodigy Kasane was scouted for her abilities. But Kasane's dreams tell her strange things, dragging the two into an unavoidable fate.