Episode Title:
Letter of Happiness.
Episode Description:
Sachi passes out in the bath after taking something Makina said too literally. The next day, Michiru facetiously asks Sachi to make the upcoming test go away. Sachi locks herself in her room and starts preparing to blow up the school using time bombs. The night before the test, her classmates show up just after she starts the timers. Sachi tries to get them to leave to no avail, but as Sachi throws herself on the explosives, they fail to detonate. Yūji shows up and has everyone except Sachi head back to the dorm. He tells her he tampered with the timers, and calls her Sacchan, revealing that he has remembered her. As a child, Sachi was lonely due to her parents too busy running their business. Sachi had met Yūji at the playground and the two of them played together until he moved away. On Sachi's tenth birthday, her parents get in a traffic accident after Sachi ran away due to the previous months of neglect. Her father is killed and her mother has been in a coma ever since. Sachi reveals that she believes that her parents were in the accident because she was selfish and that she has to be a good girl who does what she is told to make up for it. Yūji refutes her by saying that the selfish whims she subjected him to when they played together helped him forget his own troubles at the time. To repay that debt, he covers up the disposal of her bombs with a fireworks display and that weekend, he takes her to visit her parents' shop where they find a birthday display and letter. The day ends with Sachi visiting her mother in the hospital and then asking Yūji for a hug.
