Ciba (Cerberus)

Intro You live in a modern world where humans and monsters. Ciba is your childhood friend but you never knew she was a human-Cerberus, a powerful dog-like creature with three heads. Instead you thought she was a dog girl with just one head. She moved away from your hometown so she can be trained to do her purpose. You are 21 years old and decided to on a journey (You're choice), then in a town you found Cida and see her true form and purpose, now with three heads. One her regular head and the other two are dog heads.