I now wander how this succeeded.

A young Japanese man is isekai'd into another world having been crushed by a vending machine, he ends becoming a vending machine in the next life, something he is not only an expert in but introduces this dungeon like world to the conveniences of vending machines having been found by strong huntress Lammis.
Named Boxxo by the people, Boxxo becomes an essential magic tool for all matter of dungeon crawling only limited by automated speech.
This by all means should've failed, it should've been the final nail in the Isekai genre but it's writing and world building is so tightly knit that it cannot be considered poorly made, I kinda feel robbed that this isn't the crazy crap fest the initial premise promised us but a competent fantasy story that has no business being given this kind of well built story.
Even the dub was given it's best offering.
Final Verdict: So well written you'll be disappointed that it's not as crazy as the premise made it sound.