The Seed of the World Tree I.Makina sends Yūji an email stating that he has now graduated from Onii-chan status to Papa status. When a confused Yūji confronts her, Makina presents Yūji with a check for 70 million yen, the entirety of her inheritance, so that he will act as her father. Reluctantly, he agrees and proceeds to keep a close eye on her, to the envy of the other girls, especially Amane, who states that if Yūji is her father, then she could just as easily be her mother. During a break from school, Yūji takes Makina to his home in the mountains where he used to live with his master. Later, by chance, Makina encounters her younger sister and Irisu heir, Sarina, in town, but passes by without saying anything to her. To her horror, her sister's car explodes moments later. The shaken Makina is tended by her classmates and when she wakes up Yūji informs her that her sister was taken to hospital and is expected to survive. That evening, Yūji is called in to work where JB presents him with a dossier for his next job - and the target is Makina.