From Up Above (Yaoi)  (English, Paperback, Kurekoshi Sakuya)

Yuuto is an ordinary run-of-the-mill high school student. But one day hegets struck by lightning, and things start to take a turn. A strange person, whogoes by the name "Yadzuchi" shows up and starts following Yuuto around. Yadzuchiturns out to be a ghost with mysterious spiritual powers, and proclaims(insists!) that Yuuto is the reincarnation of Princess Aki from a thousand yearsago. Now, Yadzuchi won't leave Yuuto alone until he remembers who he really is!