Summoned to Another World for a Second Time has a simple premise: that being that this is the second time the hero Setsu has been summoned to this world. In theory, this opens up the door for a lot of depth. Perhaps the hero knows too much, and the mystery becomes how does he? Or maybe he does things differently, and uses his prior knowledge for villainy. Or what if he just laid low and hid in the shadows waiting for the optimal time to make his triumphant return?

This anime does none of that. It doesn't even do bad time travel. Instead, there's just a 5-year time gap between the first and second times Setsu was summoned. Also, Setsu reveals himself basically immediately as the former hero and that's that. He just picks up where he left off 5 years ago. The entire premise is wasted and only exclusively as a cheap excuse to introduce characters with no depth or backstory that instantly trust Setsu because "he met them last time he was summoned'. It's just used as a lazy hand wave to promote disgustingly bad writing and horribly cliche tropes.

It's terrible. It's cliche. It has zero depth. Setsu just aimlessly wanders for a bunch of episodes and then the final battle happens. That's basically it. Sure, he was "gathering allies", but that's really just window dressing. There is so little content that actually happens that I'm surprised they managed to stretch it out to 12 episodes. I could summarize the entire anime in one paragraph and you wouldn't miss a thing. In fact, let's try it!

That was less than 250 words and that summarized every important plot point in the show. That's just sad.

Overall, It's like they tried to write the most generic box-standard isekai plot of all time. It's legitimately hard to be more generic than this.

The first problem is, there are too many. Almost every episode for the first like, 9ish episodes, they introduce at least one new character that Setsu allegedly met the first time around. None of these characters have any depth and most disappear basically immediately afterwards only to reappear for the final battle. The one exception is Levia, who becomes the de-facto second main character by virtue of having the second-most screentime of any character, but even she has basically nothing going for her to make her any sort of dynamic character.

It's not surprising that a short 12 episode anime has no meaningful character development, but this is exasperated by the fact that there are too many characters, so none of them even get enough screentime to do anything interesting.

Animation was average, I'd say, for a modern anime, however I want to specifically point out the fight scenes which are so bad that they look like they were choreographed by a 6 year old playing with action figures. None of the fights have any impact or weight to them, except maybe, MAYBE, the final fight.

Eh, the op was a generic shounen, that reminded me of My Instant Death Ability is Overpowered but worse, and the ending was extremely out of place, hyper, and just so generic. None of the background tracks were that amazing, and in fact I don't recall any of them.

Basically, the music was dull and extremely unremarkable or memorable. But that's an opinion about music, so that's usually pretty subjective. Maybe you'll like the music.