Tomogui: que comience la caza, 1

Kaede Kanda decides to use her classmates to get revenge on their teacher, Nanami Takao, whom she hates after her best friend's suicide. However, they find Masaru Miyata, who had agreed to be part of the plan, hanged. Why did Miyata die? Is someone secretly pulling the strings? This is just the beginning of a devouring process among students trapped in the aquarium that is their classroom!