It's a relaxing slice-of-life romance that's both an isekai (Kazuhiro regularly visits a fantasy world with elves, dragons, etc.) and a reverse isekai (his friends from there can visit him in modern Japan). They see tourist spots and eat Japanese cuisine. It's a bit of a foodie show, in fact, with Kazuhiro's friends going berserk over everything they eat and the anime lingering over all their different meals.

...and that's it. Scares? Excitement? Nah, don't expect those. Nothing bad happens in Japan, while the light dungeoneering they do in Marie's world isn't much to worry about either. Our heroes occasionally meet a tough enemy, but isekai powers and general genre assumptions ensure that they'll defeat it. They'll be fine even if they don't, though. Getting killed in the fantasy world takes an unharmed Kazuhiro back to Japan, making the stakes and danger level even lower than you'd think.

Our heroes are:

1. KITASE KAZUHIRO (25 years old, human male), an ordinary Japanese salaryman who dimension-jumps when he goes to sleep. He'll have isekai skills, of course, of which the most important is linguistics. Unusually, this show acknowledges the language barrier, so Kazuhiro sometimes has to translate for his friends even in the fantasy world. (Marie only speaks Elvish, whereas Kazuhiro is on first-name terms with monsters.)

2. MARIABELLE (over 100 years old, elf female), whom Kazuhiro calls Marie. She's Kazuhiro's close friend from the start and particularly likes his cooking. It's obvious where this is going. They'll become a couple. It's inevitable. They're pretty slow about it and don't get there properly during this first season, but the audience is in no doubt. Also, they're thoroughly nice together. Neither will ever be stupid, dodgy, petty or forehead-slapping. They're sensible grown adults and don't go crazy if, say, the anime indulges in its occasional habit of putting Miriabelle in "whoops, nudity but no nipples" situations.

The only bad thing Mariabelle does is to scold a cat-person for not saying "nyan" at the end of his sentences. He'd prefer not to, but she pushes it. SHE'S A BARBARIAN. SOD OFF AND DIE. No no no no no, stop it.

3. URIDORA (thousands of years old, dragon female), with two forms. One's a gigantic all-powerful monster. The other's a voluptuous human with no nudity taboo, although she doesn't mind complying with her friends' requests that she wear clothes. She loves Japanese food even more than Miriabelle does, which is saying a lot. The two of them sound like a restaurant review whenever Kazuhiro feeds them.

And that's it, really. There's no point discussing the psychopathic sorceror Kazuhiro defeats at one point, because the victory's a foregone conclusion. More interesting is the fact that Kazuhiro's language skills let him befriend anything.

I enjoyed this show, despite the foodie angle. I liked the fact that everyone's a grown-up. When a Japanese lady gets interested in Mariabelle, they organise a dinner party for the four of them (including the lady's husband). There's a mild surprise at one point with Kazuhiro's grandad, but its implication is obvious and doesn't change anything. Ultimately, I'm a sucker for romances and this is a likeable, relaxing example without rivals or false jeopardy. It's wholesome, despite occasional fanservice. It doesn't have much in the way of dramatic stakes, but I can put up with that here.