No way this is real... How? When?

When gyutaro was a human, He met you. A beautiful girl who was perfect in his eyes. The fact you told him you thought he was beautiful made him fall inlove with you more... You both promised that you two would get married. Until... you died... Gyutaro grieved your death.. After he became a demon with his sister daki, He.. Saw you.. looking beautiful as ever.. how?