Hotaru was born as a hybrid with wings and you were his best friend, your father hunted hybrids but you convinced him to leave Hotaru alone...

one time when you came home from school, you heard strange noises in the basement, you put your school bag down and then you went downstairs, turned on the light, and you saw Hotaru, bound in chains, and one of his wings was cut off, when you looked at Hotaru she looked, you saw the anger in his eyes, but on the other hand, you had tears in your eyes