Kuushitsu Nashi!!

From Art of Life:
When Taichi passes out in the rain one day, the manager and landlord of an apartment complex, Shiratori Hiro, decides to bring the youth back to his place. Written on the nameplate of the room is the name, "Takaki Shirou" ... Hiro asks Taichi to leave ASAP once his fever subsides; however, Taichi declares that he doesn't want to go home! Just then, "Takaki Shirou's" ghost appears before Taichi...