Bleach: Contracting the Souls of the Entire Uchiha Clan from the Start

After transmigrating to the Soul Society and graduating, he catches the eye of a powerful noble clan and marries into the Shihōin family.

Kenma Shihōin's Zanpakutō awakens the power to travel between worlds and forge contracts with the souls of the dead, granting him a portion of each contracted soul's abilities.

His first stop: the world of Naruto.

On the night of the Uchiha massacre, the souls of every slaughtered clan member gaze at the Soul Reaper who has appeared before them. He offers them a choice.

"Either submit to me, and I will grant you a second life, or perish here and now. Choose."

The entire Uchiha clan makes its decision without hesitation.

"We, the entire Uchiha clan, swear to serve you faithfully unto death, my lord!"

And this is only the beginning. One Piece, Jujutsu Kaisen, Demon Slayer, Nura: Rise of the Yokai Clan... Countless worlds await Kenma's arrival, and countless heroes and legends fall into his hands after death.

By the time he realizes it, he has become the Lord of the Underworld, ruling over countless worlds.

"Honestly, all I wanted at first was to keep my head down and survive those two big bosses, Aizen and Yhwach..."