Isekai kara Elf-san ga Ochite Kita no desu ga!?

On his way home, Akio, a nice and caring guy, runs into a beautiful elf girl, Mel, who fell in from another world. Akio is bewildered by Mel, who considers him a lifesaver, and she offers her allegiance to him. But he decides that she can just stay with him for a while...! This sudden encounter will change Akio's life! An exciting love comedy of living together with a beautiful elf is about to begin!

(Source: Alphapolis, translated)