When 13-year-old Xi Ran learned the bad news that her mother was seriously ill, she was distraught. Unexpectedly, her mother actually uttered a gibberish she couldn't understand. After some inquiries, Yuran discovered that what her mother was saying was a prophecy in ancient Greek. The prophecy describes that the Greek gods sleeping in the abyss of time will awaken in the modern age. During the class island trip, a mysterious cave attracted Yuran and her friend Dusha. When they encounter the terrifying Frost Mermaid, Dusha abandons Yuizen and runs away alone. Soon after Xi Ran returned to school, the mysterious transfer student An Chen became her deskmate. Dusha's mother fell in love with Dusha's classmate Lan Haibo's father and used the magic power of the golden arrow hidden in the basement wall. This "Cupid's lead arrow" did not give Tussaud's mother her wish. She began to resent Yuizen for taking away her hope and Yuizen's mother Yuzuki. Lan Haibo and Xiran were invited to Dusha's home, and they were surprised to find that Dusha's mother was probably the mythical spider woman Arachne!
