Ferrid's manga / #Creation magic(2)

Another op japanese man isekaied to another world full of magic. Thankfully no elves or slaves or harem yet. He has a tamer ability and uses it to beef up his slime familiars. His monotone clueless is refreshing but still wet leaf and unreasonable how long he goes around doubting his strength

Op demon lord reincarnates 1000 years into the future as a young boy. He found his empire has collapsed and his followers have disseminated throughout the land. He goes about rebuilding his empire with the help of his big boobed harem