Yui takes Aki inside their high school's Civil Engineering Diving Department. The students of this course are called "Nambu Moguri" and they are expected to work in undersea construction like pipe-laying, breakwater foundation, etc. They meet diving teacher Isono Shinpei and he allows them to watch. The diver in the pool that Aki had seen earlier, has finally resurfaced and taken off his helmet. He is Taneichi Koichi, a handsome graduating student who is set to be hired by an elite company soon. As the girls introduce themselves, Aki falls instantly in love with him. At the Co-op, Aki giggles silly as she stares at a picture of Taneichi. Then while taking a nap, she has a dream of him, wherein he gives her an engagement ring. But... Aki jolts up, red in the face, and says she has had a bad dream. "In my dream, I became Yayoi-san." The blunt clerk Tamako says, "Good thing it was a just a dream." (lol I just love Tamako!) That night, Aki excitedly tells her grandma about the Nambu Moguri. "Don't tell me you want to do that?" Natsu asks. "Well, it's not possible for you." She adds. "Just took you a long time to get an uni from the bottom of the sea. How can you possibly do heavy lifting?" But Natsu says Aki's grandpa was a student of that department and he would be pleased if she became one. Meanwhile at Bar Riasu, Congressman Adachi Isao recalls his high school teaching days with his former students, Haruko, Daikichi and Sugawara. They recall how Haruko dressed up as a Sukeban (long skirt, mask, a flat clutch bag) and how she and Sugawara used to exchange a diary* ("It was over in only 3 days"). Isao recalls that when Haruko ran away from home, he wanted to search for her. "But your mother said it's okay. That you will come home someday when you're hungry." Then Isao talks about how he does not get along with his son Hiroshi. When he was in high school, he started "shutting himself off from us completely... The way he talks, everything about him gets on my nerves.
アキ（能年玲奈）は、ユイ（橋本愛）に連れられ、北三陸高校の潜水土木科の授業を目にする。金属製のヘルメットと宇宙服のような装備。伝統的な「南部もぐり」の訓練に魅了されるアキ。そしてなにより、一人の生徒に目を奪われる。誰よりも深く潜り、浮かび上がってくる種市浩一（福士蒼汰）だ。純朴でイケメンの好青年・浩一に、アキはひと目で恋に落ちてしまう。
