Synchronous Anomaly Investigator

"After the 37th parallel fusion, a 'Rain Angel' appeared at the crossroads of Shibuya, Tokyo. It appeared on every rainy day, dressed in 1923 clothes, repeating the sign language of the Taisho era. Everyone who saw it began to dream of the sunken island. I am Chen Mo, the seventh investigator of the Legend Administration, and my task is: before it teaches enough people that sign language, prove that it is not a 'legend', or let it... Can only become a legend." —————— Chen Mo accidentally obtained a diary due to the tram incident. However, the strange thing is that the content written in this diary actually came from "him" 100 years ago. In order to save the world from fire and water, and to investigate the truth about himself, Chen Mo can only take on the responsibility of saving the world.