4.449 out of 5 from 463 votes
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?
Both of these shounen-ai manga are sweet and innocent and throughly non-graphic, which can be frusteratingly hard to find sometimes. Both are set in high school are feature a sempai and kohai pair. (Only the Ring Finger Knows is told from the kohai's point of view while Seven Days is split, but mostly follows the sempai.) In both manga, the couple barely know each other and fall in love as they learn about each other's strengths and short-comings.
Both manga have a gimmick: in Only the Ring Finger Knows, matching rings are popular at the school as a way to show who are your friends and, more importantly, your lovers. In Seven Days, the kohai is well-known at the school for dating any girl for a week and promptly dumping them at the end. Both couples set foot on their paths via a misunderstanding.
If you're looking for some BL that younger people can read (or older people can read in public) both of these are excellent.