Mmmm, not bad, I give it 7.5/10, rounded up.
This is an isekai, but not a cookie-cutter one.
There are some interesting and memorable characters - the MC's helper guide has an actual personality - and there's an understanding of context and shades of grey that many isekais lack.
The MC is probably the weakest part of the story; he's kind of standard. He's an overpreparing nerd, true, but that's harder to express on an adventure. His original look had some character, but reborn as a 14-year old, he's got the most bland isekai-protagonist look imaginable.
The art is otherwise OK, people tend to actually look different from each-other.
There seems to be an actual plot brewing, because the goddess that requested a hero summon did so 300 years ago for unknown reasons.
BTW, I find it novel that the Gods are recurring characters, in what's depicted as an office drama
Over all, yeah, I'd read this.