Clay Jensen receives cassette tapes from Hannah Baker only to find out that he is one of the reasons she committed suicide. He realizes he cannot listen to the rest of the tapes his garage so he steals Tony's walkman.
Hannah's life snowballed out of control ever since she kissed Justin. She lost her innocence and rumors spread about things that never happened. After losing her two best friends Alex and Jessica because of the HOT or NOT list, Hannah began to feel lost. Her downfall continues as she is used by Courtney and objectified by Marcus at Rosie's. She has begun to lose her trust.
Hannah is now unstable and cuts her hair. When she doesn't receive any compliments from Mrs. Bradley's class because Zach stole them, she felt alone. Her change in appearance is a sign of suicide and the feeling of neglect isn't helping her cause. Hannah apologizes to Clay for not giving him the chance to save her life because she needed him. But she couldn't trust anybody.
While Hannah is house-sitting, she gets bored and decides to walk past the party at Courtney's. She would then be invited to "sober up" with Courtney and Bryce in her hot tub. It doesn't take long for Bryce to be Bryce and touch Hannah while she is half naked. He proceeds while Hannah does nothing to stop it. She has completely given in on the rumors and given up life.
Hannah's last tape is about Mr. Porter. She gave her life one last chance and visited him as a counselor. She mentioned how she is not happy and a boy did something to her. He didn't offer much support and when she mentioned ending her life. After walking out, and not being followed, Hannah knew her place in life
Now that Clay has listened and empathized with Hannah, he feels guilt and regret. But Clay has now realized how important it is to care for people. When he sees Skye going down the same path, he goes after her because he has become a very caring person.