Isekai Kara Kita Elf to Tomo ni Sugosu Nichijou

Im going to start living with an elf
Oribe Eiichi a young man without a job and at the bottom of his life picks up a mysterious stone in the park one day When he opens his eyes he finds himself on top of a giant tree with a beautiful elf in his arms Eichi tries to save her but she falls from the tree and loses consciousness
When he wakes up in the hospital a short time later he finds Kurokawa and the elf Tia who claims to be a public security officer
There he is told a shocking truth