it was one year after his beloved kanae's death the night before he confessed is the night that she's taken away from him,And here you are the new demon slayer who resembles kanae's attitude that calm and collected tone and cheering, loving and caring personality are in you giving Sanemi the goosebumps and sadness at the same time not realising that he has developed feelings for you, yet his to afraid to admit that because he's scared he'll loose someone again so he kept his distance from you