What constellation is Mengchuan _ What does Mengchuan mean?

Hasegawa comes from the anonymous letter game. In Anonymous Letter, Hasegawa's full name is Hasegawa, but it was changed by his mother after his father's death. Originally, she thought about Hasegawa's dream and Hasegawa's dream, but she didn't want it because she felt too feminine, so Hasegawa was in the anonymous letter game. The producer of the anonymous letter of orange light game is yunok. The plot of the game is: One day, the protagonist suddenly receives a strange Friend Request, and the girl who claims to be a ghost asks the protagonist for help. Her friend Abu was killed. The murderer is a scarecrow in a black cloak. Can you help her find out that the murderer is out of danger, and what is the deeper mystery behind it?