This was probably the 5th or 7th Isekai anime I saw within this month. Honestly, I first dropped it after just 5 episodes, as it felt very predictable; for the umpteenth time, an unhandsome protagonist suddenly becomes the strongest overpowered hero.
I do admit that the first episode was quite interesting and fun to watch. The anime does take a little different approach: unlike most Isekai stories that have a protagonist stuck in a bizarre magical world, this one actually has a door through which the MC can move freely between both worlds.
By the end, the anime seamlessly sets up an interesting plot that hints at an exciting second season that I am looking forward to watching.
I'd give it a rating of 6 out of 10, which is fair — neither bad nor spectacular.