do you remember what the knight looked like? :o
he was not young probably in his 30s or 40 but I remember one of the Japanese people was a girl name mitsuha(i think) and she had super strength
http://www.mangago.zone/read-manga/orenchi_ni_kita_onna_kishi_to_inakagurashi_suru_koto_ni_natta_ken/
the closest match I could find based on your description. I hope this is it!
no, it's not this one the knight was an older male from the world of magic, and people just got isekaid there
i found it!!! but thanks for helping me(⌒▽⌒) http://www.mangago.zone/read-manga/chihou_kishi_hans_no_junan/
np! i'm glad you found it :)
it's an isekai where a knight retires to guard the countryside but Japanese other worlders keep popping up and there crazy strong so his peaceful life is gone it's completed I think. pls help