Fate Is a Ninja Tonight

This story is also known as Fate/Ninjya. With no past and no way to verify anything, the Chaldea Security Organization welcomes a Berserker girl who's a mystery from head to toe. Divinity: None. Human: No. Because of her [Unrivaled Martial Arts], which places her above tens of billions of people, her one and only Master calls her “Senpai Chima.” An AoE Noble Phantasm with a built-in charge. She's practically a must-have Servant for high-difficulty singularities! A certain Miss Chima, who wishes to remain anonymous, says, “I'm on great terms with all the supports!” The first thing that happens after she becomes the Grand Berserker is that the Security Organization forcibly sends her back, separating her from her Master. Uh... The return goes wrong, and the Throne of Heroes won't accept her. She becomes a ninja! An Assassin who's not a Berserker can't become a good ninjya! In her daily showdowns with the Uchiha: No. 1, black-haired Senju woman: OvO No. 2, black-haired Senju man: =w= No. 3, silver-haired Senju man: ... One of the younger brothers just can't fit in! The female lead is incredibly strong, a ceiling-level Grand. The male and female leads have an age gap. I won't bash any original characters. I just want to write a lighthearted, happy life in the Warring States era, so please don't read too much into things! If the setting doesn't suit you, please click the X in the upper right and leave! Theme: A lighthearted and happy story is what matters most.