From Zero's perspective, he has always had an older brother who loved him very much, but his parents said he was crazy and his older brother had been dead for a long time.
Is it actually considered mindless abuse? Actually I can't express it in the introduction I want to write, and I don't know how long I can write it. Anyway, I'll write it first out of respect.
Concept: I still write it according to my imagination, don't have any negative opinions.