The Shinobi Hero (OC X Harem) (BNHA X Sekiro)

Is immortality a gift? Or is it a curse?
Mochizuki Aki, a young aspiring teenager who wants to become a an Underground Hero, is trapped in the midst of the fight for the immortal power.
Trained by a disgrace Shinobi, join our undead hero in his journey towards immortality.
Or is it towards the path of destruction?

Warning in beginning notes. Read before proceed.

This is an OC focused fanfic with events aligned to BNHA's main story. Focus on 1-B. Genderbending with slowly developing harem (not all genderbend characters is a love interest. I just did it for fun). Posted this story on AO3 and fanfiction.net

OC x Harem. More will be revealed as the story goes on