Ordinary High School Student Arata Kasuga wakes up one day and finds a mysterious black sun burning in the sky. No one seems to find it odd... and soon it becomes apparent that something is wrong.It turns out that this world was an illusion created by Astil Manuscript, a Grimoire that his Childhood Friend and cousin Hijiri left behind when the Black Sun caused the "Breakdown Phenomenon", destroying his hometown and all his friends. However, he discovers that Hijiri is still alive, and together with Lilith Azami, a girl who facilitated his discovery of The Masquerade, he decides to become a Magus in order to save her.To this end he joins a Wizarding School where Lilith works as a teacher (despite her youth), where the headmaster is a Chivalrous Pervert, and where he meets "Trinity Seven" — a school body composed of seven of its most powerful mages, of which Lilith is one. Thus Arata begins his quest to control the grimoire Hijiri bequeathed to him in order to save not only her but his entire hometown, unaware of what lies ahead.Trinity Seven: Shichi-nin no Mahou-Tsukai is an ongoing 2010 manga series by Kenji Saitou, with illustrations by Akinari Nao. A drama CD was also released in September 2011.
Henshin Hero: Use of magic requires entering Magus Mode, which involves opening one's Grimoire, an Instant Costume Change into a (cooler or sexier) outfit, and conjuring any required tools. Leaving Magus Mode returns one's clothing to normal — unless one has been forcibly returned to normal by Arata's Anti-Magic, of course.
Improbably Female Cast: Justified. Because magic is a very emotional practice, and men lean to the more theoretical side of things, there are more female mages than male. Not to say there aren't any male mages (the only ones we have seen so far are Arata and the Headmaster), they just aren't as common.
In the Name of the Moon: The Trinity and Arata's transformations begin with this: "Connecting to the [insert name] Archive, executing my thema".
Kick Chick: Akio's primary means of magic delivery is via devastating kick.
Personality Powers: Played with. Magic operates irrationally and without "common sense", so a regular mage can only use it by working with a thema that is absent from his/her normal personality makeup, subverting it for regular mages. Evil Mages, meanwhile, seem to give in to the nature of their thema and archive for power, playing the trope straight.
Power at a Price: Liese's ultimate spell allows her to freeze time, but it risks trapping her for good. Arata promises Serina to bring her sister back.
Power Incontinence: The Breakdown Phenomenon can be invoked willingly, but more commonly seems to be caused by very poorly controlled phenomenal magic power. Arata can cause it (or make an existing situation worse) if he loses control of his powers, and a similar thing happened with Yui. The Grimoire Security organization that Mira and Akio work for is dedicated to shutting down occurrences of the Phenomenon by any means necessary.
Power Perversion Potential: When Arata discusses learning how to focus his Anti-Magic attack to hit single targets, the others (not unreasonably) assume it's because he wants to be able to disrobe them more effectively.
Reality Warper: The potential heights of Arata's power, given the reconstruction of his hometown at his wish in the first chapter.
Refuge in Audacity: Arata lives by this. Every time he seems to be found in a compromising situation, he pushes it further so he can get away with just about anything being "just a joke." Magic works better for him as a result of thinking like this, too.
Refusal of the Call: When first offered power during the Breakdown Phenomenon, Arata wished for nothing more than his normal life and cousin back.