アシガール (Series) favorite_border

[DeepL Translation - needs review] Introduction to Volume 1: Hayakawa Yui is a lazy high school girl who is always late, forgets things, and dozes off, and has no interest in love or fashion. One day, she is inadvertently transported to the Warring States period in a time machine built by her younger brother Takeru. And for the first time in human history, a foot soldier high school girl was born..!

(Translator: DeepL)