Arata's life appeared normal as he looked up at the sky wondering if the sun had always been black. Things quickly degenerate with the entire town destroyed. Arata survives thanks to a trinket given to him by his cousin Hijiri. He's is taken by a mage to attend Royal Biblia Academy. Males using magic are rare, so he's the only boy. To return Hijiri to the world, he must first learn magic schools modeled after the seven deadly sins, each of which is mastered by a girl.
My summary isn't accurate and I'll get to that; but it's the main reason I picked up Trinity Seven. It struck me as quirky at first, even with the terrible flow and construction of the story were obvious. I gave it the benefit of the doubt, figuring perhaps it rushed past details and explanations to get to the... generic harem stuff. Instead Trinity Seven maintains a perpetual plot train wreck like I've never seen before.
It's a harem anime, lets get that out of the way. Arata is kind of an ass who's upfront about being perverse, so at least not a blank slate. The girl collection is mostly bad, an accomplishment considering they're the usual tired assortment. I found them strangely unappealing aside from the girl somewhat cute in her bashfulness, and Arata's grimoire which actively encourages deviant behavior. Even if it has its moments, gimmicks are rehashed until they become tiring. I won't even get into Arata's power having the side effect of tearing off the girls clothes.
The designs are fair, although the way it's animated is odd. Dazzling effects are visually appealing and animated smoothly, while character movement is slightly jerky. It's like the show clashes with itself, but otherwise looks fine.
Anyway on to the "plot" and "basis" of the anime, which I couldn't tell you much about because it's a bunch of nonsense. Fantasy is expected to stretch believability, but details need to be fleshed out in sensible ways. Trinity Seven shovels load upon load of garbage reasoning in babbling dialogs intended to explain things. Every occurrence introduces new rules and explanations, along with new methods to handle them. It's the biggest pile of bullshit I've ever seen stacked in substitute for a plot. I can't invest myself in fights making no sense, especially when I know it will make up more BS to explain why characters win or lose. I just don't care. It's not just the fights, the meandering "story" is no better.
I'm no genius, but can understand when coherent things are simply over my head. After 12 episodes I can tell you Trinity Seven has little to do with any descriptions of the anime I've read. Even by the last episode it's STILL introducing new characters just as bad as the previous ones, and nothing is resolved.
Harem anime by its nature is often weak, but they still require a story, or setup to even get that far. Trinity Seven is like multiple harem / supernatural shows tossed into a wood chipper. What's spewed out the other side is technically the same content, but not something you'd want to consume.
Arata: I love all boobs, as long as they're attached to a cute girl.
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