Welcome to Hijiri Academy! Completed only as of this year, freshmen are the only students who walk its halls; and now, a student body has been elected. As newly-appointed vice president, well-liked and cordial Midori Saejima knows she has her work cut out for her, in more ways than one: she’s been in love with the president, Akira Sudoh, ever since she secretly saw him care for a stray kitten one rainy night. As Midori’s feelings continue to grow, she finds herself more and more convinced that Akira has a girlfriend, much to her dismay. Will Midori come to terms with her feelings and confess, or accept that her love may be unrequited?
Yukino had it all. Brilliant, athletic, popular and pretty, she was the perfect school girl with many friends and admirers. But then one fateful day she met her match: a handsome young man named Arima. Now, not only is he beating her at her own game, she's becoming more and more dismayed to learn that she's developing her first real feelings of romance. Can Yukino maintain her model student appearance, or will love ruin all her plans?
Yukari is a typical high school student on the fast track to attending a university, but her boring life leaves much to be desired; that is, until a motley crew of fashion design students ask her to model their new clothing line: Paradise Kiss! Now, Yukari must choose if she will reject the life her mother has laid out for her, and start making choices on her own for the first time. While taking her first steps into adulthood, Yukari also begins to realize that with freedom comes responsibility; a life in the fashion industry isn't an easy one, especially for someone unsure of her own intentions…
Also by Ai Yazawa, Paradise Kiss is sure to please you. I don't necessarily think this recommendation is good in the other direction - Paradise Kiss is far more serious than Tenshi. That being said, if you liked the lighthearted aspects of Midori's unrequited feelings in Tenshi, you'd probably love the more dramatic, angsty version of love in ParaKiss.
Sixteen-year-old Mikako Kouda has two loves in her life: fashion, and her childhood friend Tsutomu Yamaguchi. Though she dreams of creating her own clothing brand someday, Mikako's true desires lie with Tsutomu - but there's a problem: he's dating the voluptuous and highly-sought-after "Body-Ko!" The two longtime companions seem to have feelings for each other, but school, other relationships and additional obstacles continue to stand in their way. Will Mikako and Tsutomu ever be together?
Though both are tales by Ai Yazawa, Neighborhood Story and Tenshi Nanka ja Nai sync up far more than her other works. Unlike one of her more serious stories, these two have a lighthearted, mildly-comedic feel that helps to break up some of the angst and tension. If one of these was to your liking with unrequited and innocent love, try out the other.