Takeda was a suspect in the Nanase family murder. However, he disappeared before he could be taken into questioning.
Light novel:
Takeda appeared 15 years later.
He was in love with Yakumo's mother and proposed to her before he became a suspect in the Nanase Family Massacre. Young Yakumo saw a father figure in him. They had planned to live together as a happy normal family.
Takeda's appearance 15 years later was actually his ghost. He appeared in front of Haruka so that she could save Yakumo who went off alone to Nagano. Takeda was killed immediately after the Nanase family murder and buried under a building that was in construction at the time. When the building got demolished, his skeleton became unburied so he appeared in the world again as a spirit. He appeared again because he cared for Yakumo and Azusa. He disappeared after Yakumo was saved.
