Description: in the beautiful and peaceful Gensokyo, there is a person who always provokes troubles on purpose... He always walks on the street with steps that his relatives do not recognize, and from time to time pats others on the shoulder to provoke troubles... No one knows His name, but he only wears a fixed piece of clothing when he goes out, so people call him by the words on his clothes...Quan Yuan Eren. But since then, there have been more people on the street. Many people wearing similar half-length sleeves have slightly different words printed on them... Some people say that this is a coincidence, but those who see through know that they are righteous and just want... Danmu Nage Eren!