One of the big rivers in Semarang that divides hill land of Semarang is Kali Garang. This river separates two educational institutions in Semarang, namely Unnes on gunung pati and LPMP JATENG on the other side, srondol. currently both srondol hills and Gunung pati are very crowded, different from conditions 20 years ago, when not many people live here. lots of fields, rice field and small river. People live wit another creature at that time. One of The creature of the Kali Garang has characteristics, unique and different from other regions. The author himself is interested in writing after hearing stories from indigenous people who experience, see, events meeting and interacting with these creatures.
The creature of the Kali Garang that according to the author is unique that the original form has never seen details in its entirety, only a few physical characteristics that are identified, for example having light like lanterns, having beaks like birds, moving like birds. While the characteristics of habits are appearing at night, when this creature show off, the number is one, but if someone whistles it make the number multiply and it will chase the person carrying the lantern.