An Otsutsuki from outer space, equipped with a System, a pocket dimension, and great power: Otsutsuki Huiyue became a Saniwa.
When Otsutsuki Huiyue was a child, a ball of light calling itself a System appeared in her mind.
The System said it had been bound to her since birth, but after making a calculation error while traveling, it fell asleep soon after binding to her. →_→ As time passed and its Host's power gradually grew, the System gathered energy and woke up. (This is the aloof System.)
Huiyue had a blank expression because of her environment. To the System, though, she looked completely cold and indifferent.
"Aaaah, Host, no! Don't be so cold! I... T^T"
"I'm not..."
"Hm?"
"I'm not."
"Do you mean you're not being cold?"
"Yeah."
"Ahahaha, the Host doesn't hate me!"
"You're... so noisy."
"Ahem, Host, I'm a System that can help you get stronger."
"Oh."
"I can help you become even stronger."
"Oh."
T^T
Later, Huiyue used the System's help to successfully leave the Otsutsuki clan's main household.
But the System was a useless screw-up and made another calculation error. Something went wrong as Huiyue traveled through time and space, sending her into a rift. The rift's energy was powerful, and it took her about a year to get out. She emerged covered in blood, shrunk in size, and fell unconscious in the courtyard of a dilapidated house.
There may or may not be a couple.
Theme: Otsutsuki Huiyue's life at her citadel