Imawabi no Dakini

is a Japanese manga series written and illustrated by sigama. The manga was serialized in the Dengeki Maoh magazine and published in Japan by ASCII Media Works under the Dengeki Comics NEXT imprint from June 2013.

Synopsis
Fushimi and Toume were just a normal boy and girl going to high school until one day they stumble upon a phantasmal mountain known as "Mount Hagure".

Before either of them knew it, Toume was possessed by a yōkai named Dakini, a goddess that grants wishes.

When Fushimi is asked what he wishes for, his response is: Give Toume back. Dakini says she can grant the wish but in return he must become her servant. The deal is struck. Fushimi has now become Dakini's servant and Toume has been returned. Darkness, however, is afoot and now Fushimi must take on a more active role as Dakini's servant. Is he up for the task?

(Source: Manga Updates)