Its a shield hero but it is his friend who is an isekai.

You mean the story of shield hero friends? If it's a spin off you searching, maybe the one with spear hero. There is a manga with story from perspectives of shield hero, title is yari no yuusha yarinaoshi

no not the shield hero. its about a boy who was born in a village with only shield magic. his friend is an isekai who has all elemental abilities. they meet up at school and thats how the story starts. i cant find it. seems to be deleted from my fave.