Beginning of the school year. Irene, a 27 years old girl, wakes up in her bed next to a guy much younger than her who she met the night before.

Although Irene had promised herself never to sleep with her student Isaac again, she cannot help herself and gives in to temptation once more. She regrets it immediately, especially when Isaac's mother comes to talk to her, worried about the change in her son's behavior.

Blanca fails in her attempt at intimacy with the gym teacher, Jonathan. He instead suggests dinner... and perhaps more. She prepares for their next encounter, determined to make it a success. Meanwhile, Irene visits the gynecologist due to slight discomfort and is diagnosed with a mild sexually transmitted infection.

Irene arrives at school determined to resign despite Blanca's advice. Upon arrival, he discovers that Clara has not been able to read her resignation email due to a mysterious virus.

Blanca and Irene continue with their respective emotional problems. The photos that Isaac took of Irene with his cell phone have begun to circulate around the institute, so Isaac tries to stop their disclosure.

Irene does not want to admit that she is jealous of seeing Isaac with Yoli. Yoli begins to have a strange behavior at school: she leaves the classes and disappears without giving explanations.