Nanno transfers to a school with the title "Purest School of the Year", but soon encounters a teacher who preys on students and a classmate with a secret.

At her new school, Nanno's classmates reveal a darker side of their personality and want to take advantage of her.

Nanno helps struggling classmate Mew, who feels invisible in her school of so-called geniuses.

Dino is just one of the many affluent students at Nanno's new school. He has a secret, which Nanno can help him keep, but there's a cost.

Nanno is mistakenly linked to Hann, a fellow classmate who already has a girlfriend, and he becomes a social media sensation.

Nanno becomes co-manager of the school soccer team, and the head of the team becomes envious. Her resentment begins to eerily manifest itself.

Other students who have discovered the mysterious wall start using it to get their revenge. Some regret what they've done, but it might be too late to go back.

TK is a lonely student who can't stop stealing, and Nanno only encourages him to keep doing it.

A group of students turn on one another while hiding from an escaped murderer in their school. In this episode, Nanno is shown to be a liar in an effort to instigate and escalate the situation.

A strict teacher is told to change her teaching style, but stress from her past pushes her past her breaking point.

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 position.

After opening a time capsule at a high school reunion, some ex-pupils recall an odd classmate they nicknamed "Psycho Nanno".

The truth about the highschool events is revealed and Nanno ensures there aren't any happy endings.

A popular boy in school has been getting girls pregnant, so Nanno decides to give him a taste of his own medicine.

An elite girls' school transitions to becoming a co-ed school. Nanno pushes against the strict gender segregating rules.

Minnie is a queen bee at her school, seemingly untouchable. Her outrageous behavior including drunk driving causes the death of four of her schoolmates, but her parents shield her from the consequences. However, later on when she is riding with her parents, the brakes stop working and they crash. Minnie finds herself brutally injured and killed multiple times by her schoolmates, victim's parents, and even her own parents; one for each death she has caused. For the fourth time around, she still refuses to apologize and ends up jumping off the balcony to her death.

Guest stars: Patricia Good (Minnie); Chanya McClory (Yuri); Sahajak Boonthanakit (Minnie's father); Adisak Treesirikasem (Ploen's father); Pijika Jittaputta (Ploen's mother)

Nanno tries to help a poor student named Yuri get even with the rich classmates who treat her like a servant, but Nanno may have met her match.

A senior student named Kaye takes things too far while hazing a group of junior students. This time, it's Nanno's turn to try and break his spirit.

At Pantanawittaya, students are expected to strictly follow rules without question, but Nanno relishes breaking as many as she can.

Jane, a famous live streamer known as JennyX, finds herself getting tired of her online persona and her parents, who seem to only care about her fame. Nanno befriends her, ensuring her that there is a way for her to live like a normal person. Together, they stage Jane's death during a live stream. Jane reinvents herself to enjoy her newfound freedom, but soon realizes that she wants her old life back. Yuri releases an anonymous tip to the press that Jane could have faked her death and leads Jane to believe that Nanno gave the tip. She tells Jane that the only way to get her life back is by killing Nanno. Nanno, knowing Yuri's involvement in the situation, forces Jane to kill her (Nanno). Jane then goes live and pretends that Nanno had kidnapped and tortured her, but she discovers that Nanno had stolen her life and is now JennyX. With no one believing her, she runs away. Meanwhile, Yuri points out that Nanno's wounds are not healing and that she is becoming mortal.

Junko is a student who suffers from hemophilia and moves around the school using a wheelchair. Teacher Waan, her mother who works in the school's infirmary, always takes care of her whenever she gets wounded. Nanno discovers that Teacher Waan gets monetary donations for Junko's illness and notices several students and teachers missing in the school. When she sneaks into their house, she sees one of the missing students buried in a box that Teacher Waan uses to store soil. Nanno confronts Teacher Waan about this and reveals that she knows the medicine being given to Junko is meant to keep Junko from feeling better. Teacher Waan confesses that Junko was the one who killed everyone who has been missing to get revenge for the years of bullying she had endured in the school. Fearing for Junko's future, she buried the bodies and began using disabling medicine onto Junko to keep her from killing more people. This leads Nanno to question whether punishing Teacher Waan is the right thing to do. It is then revealed that Yuri has been swapping out Junko's medicine and that Junko can walk by herself. Junko, furious at her mother, attempts to stab Teacher Waan before being stopped by Nanno. Teacher Waan then stabs Nanno continuously in a fit of rage before she is killed by Junko. With Nanno being dead, Yuri bids her goodbye and gives Junko her blood to make her immortal. As Yuri and Junko leave, a student, presumably Nanno, looks down on them from the rooftop.