Momo and Toji look forward to celebrating Momo's sixteenth birthday as a couple, not realizing Sae, who has hooked up with a supermodel boyfriend, is still plotting to break them up.
Momo suffers through the worst night of her life after Sae ruins her special night with Toji by drawing an unwilling Momo into a one-night stand with Goro, leaving both Momo and Toji heartbroken and wondering if their relationship will survive.
As they start the new school year, Momo and Toji try to get over their ruined relationship, with Momo turning to Kiley for comfort and Sae planning another dirty trick that she hopes will ruin Momo's life.