Houkago no Isekai Boukenbu - Vol. 1 Ch. 1 - That Time I had a Dungeon Behind My Room's Door

[MangaDex]

 

[DSuper]

Thanks for the chap team!

 

[Remy88Lebeau]

This doesn't seem to be a spin off but an alternate verse

 

[title_za]

So... not spin off and not reboot ,alternate universe i guest

 

[cloverwork]

thank you very much!