18+ Bake Kano

One day when average middle schooler Koji Miyahara came home from school, he found a naked girl sleeping in his bed. To his surprise, she was a ghost, and her name was Alice Fujinomiya! Alice can only be seen by other people when Koji's nearby, so she decides to become his girlfriend.

(Source: MU)

Included one-shot:
Volume 2: Range de Chin!