Botsuraku Yotei no Kizoku dakedo, Hima Datta kara Mahou wo Kiwametemita

I feel like you'd enjoy slime if you havn't watched yet. Over all slime is in the top list of isekais, but especialy this series seems really simular. 

Both MCs wake up in the body of a noble and are not the first in line to take over their family name so they set out on an adventure using their somewhat OP skills to make a living outside of their family. Along the way they both find rather unorthodox teachers who help their level up their skills and party members that help them grow on said adventure. 

Normal guy reincarnates as a OP Noble MC and has a harem around them