Yui asks Taneichi if Aki could try diving in a helmet suit. He says outsiders are allowed to try it, and Aki is immediately suited up. She goes down the water with Taneichi but every time their eyes meet, her heart starts pounding. She resurfaces quickly, causing Isono-sensei to panic. Aki complains of chest pains which Isono attributed to: "You're supposed to flush out the air outta the holes in your helmet!" Afterwards, Aki and Taneichi are alone talking. He compliments Aki's acquired Sodegahama accent. He also says his ancestors were Nambu Moguri, and that he preferred to be doing that than go to college. After graduation, he'll be leaving for Tokyo and work on a new runway for Haneda Airport. Aki meets up with Yui at the main station. Earlier, Hiroshi had asked Yui to pass a love letter to Aki. Yui is mortified by the thought. "I hate it! Handing a love letter from Aniki to my best friend!" Instead of giving it to Aki, she thows the letter in a bin and pulls Aki away. Yoshida who was eavesdropping again, picks it up. But before he could read it, Yui returns to snatch it from him, saying she'll have to ask Hiroshi to give it himself. That night at the bar, Yoshida tells Sugawara, Daikichi, Yayoi and Haruko about it. Haruko says she does not mind that Hiroshi is pursuing Aki since "he's a good boy anyway." The others remind her that she was earlier opposed to Hiroshi for her daughter. Haruko has a hard time remembering it but says she has changed her mind. And speaking of love letters, Haruko brought the exchange diary she had with Sugawara. The rest had a field day with it, reading out loud Sugawara's entries (hinted with puppy love) for Haruko, much to Sugawara's embarrassment. (Haruko only wrote lyrics from popular songs from that era). Anyway, Daikichi mentions that since Yui and Aki are somewhat celebrities, they have to, if possible, refrain from matters of love. "And to implicitly tell Hiroshi about that, too." Aki is in Haruko's 80s room, listening to
アキ（能年玲奈）は、潜水土木科への編入を、親友・ユイ（橋本愛）に宣言。潜水の体験実習では、憧れの種市浩一（福士蒼汰）に近づけて、ちょっとうれしい。そうとは知らないヒロシ（小池徹平）は、アキへの思いをつづったラブレターをユイに託していた。そして、スナックから家に帰った春子（小泉今日子）は、隠すようにしまってあった編入届を見つけて…。
