If you're looking for anime similar to Fight Ippatsu! Juuden-Chan!!, you might like these titles. All recommendations are made by Anime-Planet users like you!
Recently, beautiful girls have begun to disappear from a local high school, and it’s up to Aika to go undercover and determine the reason. Alongside Karen, who can’t seem to stop herself from looking up recently-defeated enemies’ skirts, Aika investigates the white-wearing school council and discovers that they’re abducting all beauties for mysterious purposes – and it has something to do with beams of light that emanate from the evildoers’ bodies. Who are these villains, and what do they want with all of these voluptuous, shapely girls?
At St. Mihailov Academy, strange things are happening. Not only did the dean disappear, leaving his daughter Tomo and adopted daughter Mafuyu alone, but girls in the nearby city are being killed by an unknown foe. However, the blades begin to fly when a Russian boy named Sasha arrives. He is a Qwaser, a person able to manipulate the elements after ingesting Soma, breast milk, and he’s not the only one. Soon Tomo and Mafuyu find themselves in the middle of a battle between two groups of Qwasers whose goal is to protect or steal the Theotokos of Tsarytsin. With more allies and enemies arriving, who will survive the assault?
Asobi ni Iku Yo! and Fight Ippatsu! Juuden-chan!! are two very fanservice-y series that involve extra terrestrial beings. Or at least life forms that do not originate from Earth. I do think you'll like one anime if you enjoyed the other because there are some similar issues that arise in both anime. Both series touch upon science fiction elements whereas Asobi ni Iku Yo! features some cool gun-action and Juuden-chan is a lot more silly. You also have these girls in skin-tight "space" suits while at work. The main guy somehow gets involved in outer-Earth missions and that's when more powerful forces take interest in him. I think Juuden-chan takes a more "ecchi" role with its urophilia while Asobi ni Iku Yo! takes almost every opportunity for nude shots. Take your pick.
Funko, Shigu, Eru and Ichiroku seem to be typical school girls on the surface, but they're actually powerful, dangerous guns that must be treated with care and respect! Together, they attend Seishou Academy, a special place where not only are all of the students guns, the teachers are as well. That is, except for one new educator who arrives, unaware of the crazy, dangerous times that lie ahead!