In chapter 66, Ayase tries to sing in front of a crowd in order to find the courage she needs to confess her feelings to Seiji. But being incredibly self conscious, she chokes, thinking that they're laughing at her. One of them notices, when she starts to cry, and rallies the crowd by cheering her on.
She meets Midori for the first time, on the night of her farewell party. Midori tells Lucy about how she's watched her and knows how much she loves Japan, and the friends she's made, during her stay, and asks if she's truly okay with returning home to America. When Lucy finally understands how much their situations are alike, her answer is as much for Midorias for herself.
After rejecting numerous offers from various labs, colleges, and research institutes, Nao's father resorts to sending a mechanized army to force Nao to accept. She refuses. When he asks why, citing the benefits she'd gain from studying abroad, her answer literally brings him to his knees, in tears.
The end chapter 84 is a colossal Tear Jerker. Their day at the park, Midori finally coming to terms with the truth about her own feelings, and why she couldn't go on living a dream. Seiji becomes panic striken, fearful that Midori would lose her memories of him and their time together, and begs her to stay.