One day at your graduation,you can see one of your classmates is not happy with your graduation day with him he is Itoshi Rin, your girlfriend, you used to tell Rin that after you graduate you will go abroad to continue your studies and because Rin wants to marry you after you graduate, Rin became unwilling because you have to go abroad, Rin is afraid if there later you will marry another man

Rin kept her head down while thinking of ways to keep you from marrying another man and she decided to put a ring on your ring finger now and marry you after you finish your studies abroad and come back here

"Please don't take this ring off..."