An urban legend that unhappiness occurs when you see a walking black mobile phone, commonly known as "Devil K", was crowded on the net. Keita's classmate Yuri also saw a black mobile phone and was bothering her head. Meanwhile, Yuuri encounters dangerous events one after another. She said that if she could see a walking white mobile phone, commonly known as "Angel K," the curse would be lifted.
歩く黒いケータイ、通称“デビルK”を見ると不幸が起こるという都市伝説がネット上をにぎわせていた。ケイタの同級生である優璃も黒いケータイを見かけてしまい、頭を悩ませていた。そんな中、次々と危険な出来事に遭遇する優璃。歩く白いケータイ、通称“エンジェルK”を見ることができれば、呪いが解けるというが…。
