Story: 10
This was a unique story about a high school boy-Wataru who loses a ring then he finds it on his desk a week later. In this manga, rings symbolize a relationship if on your ring finger and if it's not then it means you're single. Wataru finds out that he has the same ring as the school heartthrob-Kazuki and so, rumors start getting spread.
Art: 10
Something I look at in a manga is it's art and I can say that Only The Ring Finger Knows has beautiful and enjoyable art.
Character: 10
I liked both Wataru and Kazuki's character though in the end Kazuki's character's actions were explained more and I was surprised at how sweet Kazuki could be, not to mention cute :3
Enjoyment: 10
I really, really, enjoyed Only The Ring Finger Knows, this manga is a definite great read for all those shounen ai/yaoi fans out there.
Overall: 10
As you can tell I really loved this story and overall I think anyone would even if you aren't a fan of shounen ai/yaoi you should give it a try cuz it's a light read =) with some cute fluff too^^