「自分がされて嫌なことはしない」白川さん（井桁弘恵）だが…、同期の谷口さくら（藤野涼子）に嫌な態度を取ってしまい、うまく笑えなくなっていた。そんな中、自分の知らないところで谷口さんがフォローしていてくれたことを知る。
そこで、改めて今まで書き留めていたノートを読み返すと、新人の頃に谷口さんから言われた「未来の自分の為に」の文字が…。一体、白川さんと谷口さんの仲はいかに…？そして白川さんの笑顔は取り戻せるのか！？ついに最終回！
"I don't do anything I don't like," Mr./Ms. Shirakawa (Hiroe Igiri) says, but she has a disgusting attitude towards her classmate Sakura Taniguchi (Ryoko Fujino), and she can't laugh well. Meanwhile, I learned that Mr./Ms. Taniguchi was following me without my knowledge. So, when I reread the notebook that I had written down so far, I found the words "for my future self" that Mr./Ms. Taniguchi said to me when I was a rookie. How on earth are Mr./Ms. Shirakawa and Mr./Ms. Taniguchi getting along...? And can Mr./Ms.'s smile be restored? Finally the final episode!
