What would a Highking do in an Alternate World?

After a love crazed drama, Itsuki Hashimoto, otaku and world-renowned martial artist has fallen under the wicked betrayal of his beloved. As his life fades away, he swore to never again be blinded by mere beauty and to always stay true to his martial arts. He was then reincarnated into Gaia, a deadly but an oddly similar world to his original world, filled to the brim with dangerous mythological creatures..as a girl?! Hahaha, Demon Lords? Gods? Even if I am reborn as a girl, In this Crazy World I'll fight them all!