Nozomi Kuroda is in the 2nd grade of high school. One day, she finds a letter in a classroom desk. The letter has only the word "like" written on it. The person who wrote the letter is Jun Setoyama. He happens to be the most popular boy at the high school. Nozomi Kuroda feels embarrassed, but she eventually leaves a reply in a shoe closet at school. This is how their secret exchange diary begins. Nozomi Kuroda soon learns that the intended recipient for the first letter was her best friend. Nevertheless, Nozomi Kuroda is attracted to Jun Setoyama, who expresses his thoughts and feelings unlike her. She's unable to tell him the truth that the person exchanging messages is her and not her best friend.
High school students Takeshi and F1 were working part-time to earn money by stealing mopeds and selling them to delinquents. One day, Ayaka, who has transferred to the school Takeshi attends, joins them, and the three of them decide to steal a moped. When he tries to steal a moped parked in his apartment, he is found by a woman wearing a mask who seems to be the owner. Takeshi and his friends escape on a motorcycle, but they are quickly overtaken by a running woman with unbelievable physical abilities. This masked woman was a slit-mouthed woman who ran 100m in 6 seconds with her mouth split all the way to her cheeks.
At an isolated reform school, transfer student Itsuki joins a drama group—but when real murders mimic their dark plays, fear, love, and secrets spiral out of control.
Jun and Yoriko are a couple living in the same apartment. Always busy with work, Sunday is the only day they can spend in each other's company. One day Yoriko decides to "smoke" cook some food. Preparing the food together, waiting for it together, eating together… as long as they're together, they're happy.
A group of high school students are forced into a game where they are hypnotized to commit suicide on an unknown command. Where no one is safe from a sudden death, how can they avoid their fates?