Wearing a ring holds a variety of special meanings. Wearing one on your right middle finger means you are single; matching rings on the right ring finger shows friendship; and matching rings on the left ring finger signifies a couple. Wataru wears a single ring on his right middle finger and never thought it was a big deal - that is, until one day he discovers that he wears the exact same ring as his hugely-popular upperclassman Kazuki. However while Kazuki's reputation paints him as a kind and friendly boy, he is nothing but cold and ill-tempered towards Wataru. Finding his senior to be little more than a jerk, Wataru finds the existence of their matching rings to be thoroughly annoying. As their paths cross more often, Wataru begins to question his true feelings, but why is it that the supposedly gentle Kazuki is only cold towards him?
Only the Ring Finger Knows (Light Novel)