Looking for a specific isekai

[PhantomNull00]

Potential spoiler. Guy gets isekai’d and is the typical strong kid protagonist. He gets sent to live with his grandfather who is a former hero and also was isekai’d. He goes to a dungeon with his grandfather but the grandfather is defeated by the monster there.

 

[Prylix]

@PhantomNull00 is it this one ?https://mangadex.org/title/36273/keizoku-wa-maryoku-nari

 

[PhantomNull00]

@Prylix that’s the one. Thanks!