Wiedergeboren als Sohn meines Erzfeindes

I was once a feared yakuza demon, but died at my nemesis's hands. When I opened my eyes again, I had transmigrated into his newborn son's body! I swore revenge, but could only cry. Just as I decided to be patient, my "mother" embraced me against her soft bosom... and the flames of vengeance temporarily died down. Then one day, my enemy father selected a lineup of wet nurses for my inspection, and I realized—revenge is too boring. My new "yakuza" path starts now!