True Balance: The Genesis
3. 14-year-old Katie's dream is to walk the high wire. But (not being a Wallenda) she needs to start somewhere, to prove she can do it. She joins the local gymnastics club, becomes a balance beam specialist, and makes the Olympic team.
4. In the beginning was a system in which the Upper World, Middle World and Under World were perfectly balanced, allowing for a functioning society. Enter Yukata Tousinin, a ruthless teenager. Will he screw everything up for everyone, or spark a revolution? Doesn't matter to him, as long as he gets the girl.
5. The true story of how the shoe brand, New Balance, began. The highly-anticipated sequel to Forbidden Fruit-of-the-Loom.
I’m writing this letter seeking representation for my novel, True Balance: The Genesis.
Set in a system, whereby Aregon, the Upper World; Diagon, the Middle World; and Necron, the Under World, function alongside each other like gears in a machine- and all inter-dimensional governance is in accordance with a document euphemized as The Treaty. [Was that a sentence? It seemed to end before reaching the subject and verb, which are conveniently located at the beginning of the next sentence. Of course, combining the two sentences will make for a very long sentence, and it was already too long. You could remove "Set in a system whereby," which will make the original clause a sentence, but a better idea is to open with the part where you introduce your main character.] [Also, I can't tell if the three Worlds are different dimensions or if they're all in one dimension that has a treaty with other dimensions.] The story focuses on Yukata Tousinin, a funny, yet ruthless and unapologetic teenager, who has to journey through these worlds in search of his love interest, Amara Prescott- who was sold into slavery. Yukata risks defying The Treaty, ruining friendships, becoming a fugitive, and overcoming doubts; when a new love interest enters his life, to retrieve her. [I don't think "overcoming doubts" is something he risks. Experiencing doubts maybe. In fact, if he actually defies the Treaty, ruins friendships, and becomes a fugitive, just say he does so, not that he risks doing so.]
We need to know how long the book is and who the audience is. But mostly we need to know what happens. You've provided the names of some worlds and mentioned a Treaty with no information about what's in it. Your plot summary is a teenager tries to rescue his love interest from whoever bought her as a slave. We need more than that. What's his plan? What obstacles does he face? What's the penalty for defying the Treaty? Who's after him? Why should we even care about a ruthless and unapologetic teenager? Maybe I'd rather read about how Amara Prescott escapes and exacts revenge on slavers than about how she gets rescued by this Yukata jerk.