Mistress Of The Evil Forest - Case 163: Confession.

When Shu Tang, a sickly young woman, fell ill and passed away in the 21st century, she thought she would finally be able to drink a bowl of Meng Po’s soup, take a trip across the Neihe bridge, and not be such a sickly person in her next life.

But, after her soul left her body, forget about Meng Po’s soup, she didn’t even see soup dregs before being transmigrated into the body of a pig!

After being adopted by Fuyu Shangxian, one of the three great immortals and heaven’s peerless beauty, hilarity ensues.

- Description from Novelupdates

Arakawa Kouki is reincarnated to a Japan with a different history than the Japan he knows with the memories of his previous life still intact. Kouki was discouraged, “Aren’t reincarnation stories supposed to be at some fantasy world filled with swords, magic and elves?!”

The protagonist is an accidental time traveler - he didn't wait, didn't guess, only dreamed, but ended up in history, which he didn't pay much attention to. He was just lucky with his lineage.Ryo is a new member of the Nara clan, from the Uzumaki lineage on his father's side, and it so happened that he was born not at the beginning of the known plot, but more than three decades and two world wars later. Now he has to figure out how to get out of this situation however he can.

WARNING: FL is scheming and evil.