I Summoned the Zenin Clan's Ancestor

Huihui has always been a sensible, reserved child. His dad has been mooching off others for meals for ages, and now he's on the verge of going under, so Huihui decides to support himself and stop being a burden. Then the Zenin bloodline awakens, and he summons a shikigami: an incredibly beautiful shrine maiden, a nanny-type shikigami codenamed Princess Kaguya.

This shikigami is a little slow and has lost her memories, with no idea who she is. She wears gorgeous clothes from some unknown ancient era, but now the five-year-old has to take care of her. He can barely manage looking after his dad. Does he really need to take on one more person?

Later, he discovers that this shikigami can not only purify water, but also teach him jujutsu and techniques?

Then the shikigami goes and starts a bottled water company, becoming a rich boss lady, and now his dad wants to mooch off her too.

The Zenin clan comes to snatch the talented Huihui, only to discover that Princess Kaguya looks exactly like a portrait of an ancestor left in the shrine. An ancient legend has also been passed down: she was one of the great sorcerers who sealed Sukuna, and the mother of the Ten Shadows Technique!

She carries the legendary Four Souls Jewel, said to grant wishes, and draws covetous eyes. The three great clans send people to protect her.

Some trashy dad: "Miss Princess Kaguya, since you like Hui so much, why don't I marry into your family? Then Hui can call you Mommy for real."

Some delinquent teacher: "Your aunt sure is rich, huh?"

The King of Curses, sealed inside Yuji: "Well, if it isn't an old friend! Thanks for cutting my body into pieces back then! I hear your husband killed you. Congratulations!"

Princess Kaguya knows that she's dead, and that her name isn't even real. Summoned from the void into the world of the living, with no memories or past, she drifts through life as a little kid's shikigami. Feeling sorry for him, she reintegrates into society, only to accidentally become a rich woman.

Pairing unknown, outline undecided, plot all over the place. A sudden idea that popped into my head. A crossover with multiple anime series.

Theme: Perseverance and persistence lead to success