Hidan no Aria, Rail Wars! Recommendations
Both have the same situation where it involves teens doing public safety.
Both involves the same plot where the public is in peril.
Both have the same harem element,
Both also have the same action genre.
One was set in a school where students need to do a job for grades, while the other anime is a place where teens works to earn their checks.
One involves a two people duet to do a job, while the other is a 4 people job.
The same plot where it involves teens who are into public safety, it also involves the same intense fighting.