No-Harem ୧•░║║░•୨ACTION -Gem Box 2

Anyway so mc was the strongest in the yokai realm became the king there ....Later he gained the chance to become a human being after losing the woman he loved and killing countless yokai since he wanted peace ...so mc got transmigrated into the body of a young master from merchant family with weak ass body ..

mc died while fighting monsters so his partner reverse time & he went back to past ..Now he is training since beginning to become stronger

MC is the last successor of a fallen founding contributor family faced hardship after his father died in war & his territory captured ...He tried to regain his prestige by entering academy but failed due to his narrowing veins which shattered his dream of becoming a mage ..mc started working as mercenary while managing to reach 2nd circle mage , a 3rd rate mage ..One day while doing a cleaning job at a museum his mother's memento ring reacted with the dragon heart & he got a chance to redo his l

On the brink of humanity’s annihilation, the four strongest survivors tried to prevent it by sending back the strongest mc back in time to the point just before humanity was pulled into the Abyss & transported to another world ..mc being a regressor knows lots of stuff but is focus on his goal & is nonchalant who will kill anyone to get strong but they are already hinting romance