Kimi to Ikirareru nara Shindemo ii

"I can't remember someone important who was always beside me."
Houri, who lives a very ordinary life, is drawn to a crosswalk and almost gets run over by a truck, but is saved by a man who passes by. The moment he sees the man's face, he has flashbacks of his past life, when the two of them were intimate. The two are led by a super-powerful...