Nihon e Youkoso Elf-san.

Elves in modern day Japan except the premises are different as to how they came to be on Earth, one having been summoned there ages ago whereas the other magically appears there from the isekai. The elves become accustomed to their new place and are cared for by someone, Edomae being the family whose shrine she's in and the other one the guy who she was in a party with in the isekai. Major difference is one is more just whole-hearted slice of life whereas the other leans more towards slight romance between the elf and the male MC but heavily revolves around transporting back and forth the other world adventuring there too, meanwhile Edomae only revolves around everyday fun and calm life in Tokyo. read more 

Both of these stories are very similar with themes of isekai and reverse isekai. Sasaki to Pii-chan focuses more on the business and magic building themes, whilst Nihon e Youkoso Elf-san has more emphasis on an elf from another world discovering Japanese culture, with strong labyrinth adventuring in the iseaki world. Additionally, Nihon e Youkoso Elf-san has a much better relationship between the two lead MC's than Sasaki to Pii-chan does.  

Reverse isekai where a cute girl with magical powers suddenly appears in modern-day Japan and ends up finding herself living with a male protagonist. Adult casts and humor are shared, as well as the blend of modern technology with the female main character's magical powers. 

Both MCs can travel to another world while asleep. One via dreaming and the other via a COMA. These MCs aren't all that strong but they are typically accompanied by female party members who are. They also find themselves befriending the craziest of monsters! 

Both MCs can travel to another world while they are asleep. One via dreaming and the other via a COMA but they also both have Elves as their main party members. These girls are obviously in love with the MC but he doesn't know!