The story basically follows Arata, whose cousin and childhood friend Hijiri disappears during a big magical disaster, which motivates him to enroll in a magic school to become a mage in order to find Hijiri and bring her back (conveniently, Arata appears to be the only dude in the academy). The Trinity Seven are the seven most powerful mages at the school. Arata befriends the Trinity Seven and harem-esque scenarios ensue.
Probably the biggest reason Trinity Seven stands above the rest of the genre is that the MC isn't an incompetent idiot. Arata is driven, strong, and most importantly, not irritating. He's a very likable lead and his pervyness provides laughs throughout the series. 12 episodes doesn't give a lot of time for character development but you know right from the start that Arata isn't lame.
The Trinity Seven are, as expected, a group of very powerful and very beautiful young ladies. They basically all fall into one trope or another, but were you really expecting anything else? The important thing is that they're all likable. In fact, I don't think there's an irritating character in this series. The show puts focus on Lilith, Liese, and Mira, which unfortunately leaves the rest of the Trinity Seven feeling rather one-dimensional. 12 episodes is just not enough to develop every one of them. This series could easily have been twice as long.
But despite its short length, the pacing is, for the most part, on point. My biggest complaint is that the show stumbles in the last few episodes and the story gets muddled. Too many new characters are interjected and I felt a little confused after the last episode, but the ending sets up nicely for a second season, which I certainly hope will be produced.
Trinity Seven does a lot of things right. This is excellent execution of a very familiar formula. Big props to the art team for the excellent animation job and the sharp, attractive character designs. Most harem anime tend to get boring fast, but Trinity Seven held my attention. It's a nice, short, fun series to watch when you have some time on your hands.
