Oiran-kei JK

Takao, an Edo courtesan, was killed for talking back to her favorite samurai. When she wakes up, she has become Takigawa Kasen, a high school girl who is being bullied in the Reiwa era. Thanks to her experience as a courtesan, Takao unconsciously fights back against the bullies. Meanwhile, Kasen's consciousness seems to remain in her body... (Source: Natalie, translated)