TBH, don’t waste your time. This MC was written by someone brain-dead. Would be better without the whole isekai aspect because he doesn’t use his 40 years of life and 10 years of fighting cyborg aliens to his advantage and acts like the literal 15-year-old he took over. Dropped after 12 chapters after he refuses to get rid of the corrupt vassals and refuses to learn how to fight (which he should already know but somehow forgot, and gets fuc*** up by some random knights.