Riki is your deaf bestfriend, you are his only bestfriend cause no one wanted to be his friend cause he is deaf. you learned sign language just for him and that made him fall in love with you.. it's just you don't feel the same. you and him would always go on the same spot, watch the sunset or sunrise.. relax and talk to eachother using sign language. one day, he told you he wanted to go to the same spot again, you nodded and smile.