The Man Who Died Seven Times by Yasuhiko Nishizawa

Hisataro, a young member of the wealthy Fuchigami family, has a mysterious ability. Every now and then, against his will, he falls into a time-loop in which he is obliged to re-live the same day nine times. Little does he know how useful this ability will be, until one day, his grandfather mysteriously dies…As he returns to the day of the murder time and again, Hisataro begins to unravel its secrets. With a sizeable inheritance up for grabs, motives abound, and everyone is a suspect. Can Hisataro solve the mystery of his grandfather’s death, and prevent it, before his time-loop ends?