TSUIHOU SARENAKATTA OTOKO: NIDOME NO JINSEI WA DOGEZA KARA HAJIMARIMASHITA

Cross Visch, an ordinary villager, somehow ended up joining the hero's party. Cross is an ordinary person with no special powers. And yet, for some reason, the heroes truly considered Cross to be a member of their party. There was no way he would be kicked out of the party. That's why Cross continued to worry. What could a useless person like him do as part of the hero's party? And then... Cross came to understand his own role. At the moment the Demon King cast his magic at the hero as he was dying... — Description from AniList community (anilist.co).