So this is the gist of the story. A boy come home one day to find that his room is not his room. It seems that his room and another girl's room have somehow have become connected through magic (never really explained). The girl, when she sees the boy doesn't freak out, but thinks that he is god come to help her. The boy not really knowing what is going on eventually goes along with what is happening. At first he dislikes his situation but slowly the girl starts to grow on him. The boy helps the girl by tutoring her to help her get into highschool. After she is accepted the link between their rooms is cut and her no longer sees her again... or so he thinks. When he is giving a speech to the newcoming freshman at his high school the girl happens to be close to the front and yells out something along the lines of "God!" pointing at him. It seems that they are now going to the same school, and although he doesn't show it to her, he is happy about what has happened.
It isn't that long of a manga but I really enjoyed it and want to read it again, but I can't remember the name of the manga! Please help me if you know the manga I'm talking about could you please tell me the name.

Kamisama Onegai! (MITSUKI Kako) It's a one-shot.

Thank you very much! You really helped me out.