From the title you can probably see the theme has to do with the concept of the 7 Deadly Sins, but in this case, as magical arts through the 7 Archives as well as your individual 'Thema,' (basically Class and Sub-class). So without further adieu, let's begin this review!
Animation
The visuals in this show are quite appealing, both the animation of each individual character and the settings and backgrounds alike. The lighting and shading as well help to invoke the feeling of every scene. Sometimes background images and characters however can be either highly distorted or have a dramatic lack of animation, but nothing too serious. Otherwise, I would compare the style of animation, especially character-wise to that of the anime DanMachi, however, I would say it is not as good, or in-depth.
Story
After watching the first episode of Trinity Seven, I admittedly had no clue what was going on. Nothing about what was occurring within the plot-line was really explained, not even a little. It did have an over-looming objective that the main character, Arata wished to accomplish, but nothing about the setting, people, events, etc. were really explained in the first episode, let alone the next few. For being a 12 episode season, I felt that this was a definite issue with the series as a whole because I felt like I had to search for the meanings to things that I didn't completely understand all too often. Also, I felt the progression of events within the plot went wayyyyyyyy too quickly. I would say it is almost comparable to that of the Aincrad arc of Sword Art Online where everything felt extremely rushed and as though a lot of details and plot elements were missing.
The story itself wasn't that bad, and nothing really stood out as being inappropriate for the plot-line, I was simply left wanting a lot more out of the 12 episodes.
Sound
The music used in the show is absolutely fantastic. That being said, there were definitely scenes where the choice of music was probably not the best (Ex. episode 3 the bath scene). Otherwise, the moods of most scenes were captured brilliantly and sounded wonderful. With regards to the voice acting, the only thing I have to say is that it was pretty good. Every voice suited their character nicely, especially Arata's (Arata is voiced by Yoshitsugu Matsuoka who also happens to voice the main protagonist of DanMachi, Bell Cranel).
Characters
Ahh, the characters, possibly the most prevalent and amazing aspect of this show... is what I would say if I felt there was any real character development other than with Arata. I may rant a little here so bear with me. The main protagonist is technically meant to be the most important character in a show, especially when a plot point states that each Trinity Seven becomes the harem of the Demon Lord Candidate, but when there is little to no real development of any other characters, whom I might add are considered main characters, I get a little annoyed. I understand that this show has the Harem genre to it, but that doesn't mean the other main characters can't have more story than falling for the protagonist. This whole lack of development really reminds me of Sword Art Online, which if you've seen the series, you probably understand what I'm getting at.
Although, where the series lacks in development, it does not come up short in each characters individuality. As magic is basically the main theme of Trinity Seven, it's not surprising that each individual has their own unique style and way of using it, but the characters that fit each style, simply make sense... in a very good way. Each character is what you would think of them as, and they absolutely excel at there skills, which is quite enjoyable to see. Overall, their appearance and actions are pretty cool.
Verdict!!
So, should you watch this series? Yes. Trinity Seven, overall, was enjoyable to watch. Though it had its fair share of mishaps I would still recommend it to someone to at least experience, if nothing else. Especially when considering its opening, because holy s*** is it good. I mean, resemblance to Death Note much?
This series was fun to watch and has some great comedic elements as well, believe me, there are some REALLY funny scenes. So yeah, I'd say give it a try.
