Reincarnation no Kaben

Touya Senji struggles with a lack of talent, unable to succeed despite his best efforts. His life changes when he meets Haito, a skilled Kendo champion who also serves as humanity's protector. Haito utilizes the Stem of Reincarnation, a technique that allows her to draw upon the abilities of her past lives. However, this power comes at a steep price: she must slit her own throat to activate it. Now, Haito seeks Touya's assistance, thrusting him into a world of danger and sacrifice. The anime explores themes of talent, perseverance, and the lengths one will go to protect others.