Hiyori has only just recently discovered that she's in love with Yato. His goofy personality, his odd sense of style, his sharp blue eyes, his dark purple/black hair, his charming looks. She could go on forever about things she loves about him. However, Tenjin informed Hiyori that Gods don't fall in love with humans that way and it crushed her heart. She wants to find out herself if that's true. After all, she was half phantom and not entirely human.