You can say that twice.
The web novel ended at more than 200 chapters.
The Light novel reached 3 volumes before stoping releases, 2+ years ago.
The manga was axed without even a closure chapter, when this kind of adaptions being cancelled is not uncommon is unusual for it not even get epilogue chapter this a rushed plot.
The artist of the manga makes hentai, and is even pretty good, had to nerf himself a lot for this adaptation, still decent but anyone that sees his stuff will agree with me, unfortunately it happens all the time, Eroquis started a isekai adaption and his quality was lowered a lot for a monthly release, and personally it looks like it hit his hand as his stuff is not as good as before.
The work had problems from the start, with the MC not knowing about dungeons for years, I checked some parts of the raw novel and the story makes wild jumps again and again.
One of the worst parts is how he becomes able to summon the bully that ruined him from hell and I couldn't find a single chapter where it was done, author cretaed a massive Chekov gun gimmick and made it get dust.
I found a chapter with MC saying he did summon her, but couldn't find the chapter, worse part he should have done so often as her unique skill is level drain, something very useful to him, but it seems like he did it once and that was it, or never shown it happening again.
To add to it is implied the bully soul is in a daze state, would have been much more satisfating if she was fully conscious and begged to be summoned more often to escape the torment of hell, treating MC like a supreme being.
She even have one of the best design in the manga for the girls (truly a bitch in her core though and deserved to die pre-story start).