Posthumous writing

In a corner of Tokyo Street, in an abandoned hut on the top floor of a high-rise building. Machiya Shota was making his dream torch, and the body of his friend Ayase Asuna's father appeared in this building. The police investigation yielded little results. But the next day, a white-haired girl brought Shota a "posthumous essay" written by Asuna's father to Shota - a message left by the dead to the world of the living. The girl who sent the letter called herself Wen Ge. What are the contents of posthumous writings? Is it a yearning for the world, or an instruction to the living? A series of "posthumous letters" led to a series of human tragedies. And Wen Ge, the girl who delivers the message, seems to be hiding an ulterior secret.