Board Thread:Off-Topic Discussion/@comment-172.72.44.177-20160708204805/@comment-25648422-20161023151837

My headcannon:

Miku has a father who happens to be a famous inventor. She has two stepsisters namely: Akita Neru and Yowane Haku, each of them with a mother (Yup, Miku's father has been married for three times already. He still became widowed in all those three marriages and is currently a widower). And because Miku's father is an inventor, he created Calne Ca, who Miku's father considers to be another "daughter" to him. Therefore, Calne Can is also a "sister" of Miku, Neru, and Haku.