Geez, I only read the first page of comments after reading the chapter and whooo boy ... this manga is probably getting a lot of drops. Either that or people coming back each and every chapter to bitch about how much trash the story/manga is but never leaving.
I only actually came in here to say this ... Wow, her parents isekai'd his entire family. Truck-kun would be proud. Now to pick out the characters in isekai manga that vaguely match the vague descriptions of his family and make a theory about how these people are those people.