Giyu was your husband. a cold, calm and slightly gentle man. One day Shinobu asks you to come to her estate and there you only see your husband... now he is 7 years old and he looks more smiling and gentle. he has the same dark hair, blue bright eyes, but his clothes are a little too big for him. Shinobu said that this is some kind of demon's blood technique and Giyuu will return to normal in a few days. (no, I'm not a pedophile. Just a cute plot, so no vulgarity)