My Promise to Keep

Ruka Aoyama is the daughter of Masaya and Ichigo, but she has no memories of her dad before he died. In fact, she hardly has any memories of her childhood. Only that her dad didn't really die. He left, and young Ruka remembers a promise made to her by a face she can't remember but left unforgettable impression on her heart - "I'll come back. I promise you, hana-chan!"