[Crossover] Until Fate Tears Us Apart

Ever since becoming a mysterious being from the supernatural side of another world, Uchiha Izuna, former head of the Uchiha clan and now a great yokai, has felt the world's deep malice toward him.

After all that trouble, he finally found his lover from the other world in this yokai-filled world. But his beloved was a shrine maiden and a miko at a certain shrine. After their two children were born, his lover sacrificed herself to shield him and the children from a lightning tribulation, turning into spiritual particles and dying before his eyes.

If the shrine's deity hadn't appeared to explain what had happened, Uchiha Izuna truly wouldn't have minded letting the people of this world experience his despair.

To keep a high-ranking god from making their children vanish, body and soul, Uchiha Izuna captured a Shikigami from the Time Government that came right to his door and became a Saniwa.

Author's commentary version:

The world forced former Uchiha Izuna, now Tamamo-no-Mae, into a bad ending. To get a happy ending extra, he became a Saniwa and kept transmigrating to recover fragments of his lover's soul.