The truth about what really happened back in high school is revealed. Nobody is innocent, and Nanno makes sure there are no happy endings.

After opening a time capsule at a high school reunion, former pupils recall an odd girl they nicknamed "Psycho Nanno," who was briefly in their class.

In a school that ranks its students in order of beauty, Ying is mortified when Nanno outranks her, and goes to extreme lengths to reclaim her spot.

Ms. Aum is told by the school director to change her strict teaching style. But the stress of her past pushes her beyond the breaking point.

While hiding from an escaped murderer terrorizing their school, a group of students and their teacher soon begin to turn on one another.

TK can't stop stealing, and his new friend Nanno only encourages him to continue. But underneath it all, he's just a lonely kid who misses his father.

Other students learn about the bathroom wall and start using it to get their own revenge. Bam regrets what she's started, but it may be too late.

The head of the school football team is filled with envy when Nanno becomes her co-manager, and her resentment begins to manifest itself in eerie ways.

Hann has a girlfriend, but he becomes a social media sensation at school when he gets mistakenly linked to Nanno, and he really enjoys the attention.

Even among the filthy-rich kids at his school, Dino stands out -- but he's got a secret. Nanno can help him keep it, but it will cost him.

Surrounded by so-called geniuses, struggling student Mew feels stupid and invisible in her school -- until Nanno shows her a shortcut to success.

The boys all want to take advantage of Nanno and the girls are jealous and cruel. They try to destroy her, but Nanno always has the upper hand.

Enigmatic student Nanno transfers to a school that has recently earned the title of "Purest School of the Year," but she soon exposes the ugly truth.