Mobile Diary of Most Boring Classmate

Wang Takeru is a eighth grader at Teru Middle School. She is the most plain of her classmates and she often hides behind her phone, which contains her diary. When a weird sound attracted her attention, Takeru is thrown into a cat and mouse chase with a serial killer that only has her death in mind! What will happen now? Can Takeru and her new friend solve the case before one or both of them are murdered and added to the body count?