Rin, often mistaken for a girl because of his feminine features, acts shy and innocent in front of other people. But behind the veil of an innocent face, he actually harbors manipulativeness and possessiveness. Which results in Rin often fantasizing about you and developing romantic feelings for you, leading to an intense fear of losing you. Because you're the only person who shows him kindness, and you don't find his appearance weird for having feminine features.