As an illegitimate son, Tomichiro Ryuzaki was suddenly brought into the home together with his mother by his biological father Kosuke Ichinomiya, and their identities were recognized. He began to get along stumblingly with his brother Qinghe, who was a few months older than him. Although he was always being bullied by Qinghe inexplicably, Zhi gradually discovered that he was actually just a lonely and kind-hearted child, and developed a liking for him. At this moment, his father Kosuke appears. What is the truth about his strange relationship with Seiwa and his weird attitude towards Tomo?