交際が順調に進む中、真戸原 (松村北斗) は恋の悩みを翠 (板谷由夏) に相談する。瀬奈 (川口春奈) との同棲を考えているが、一緒に生活すると、互いに気になる点が出てきてしまうのではないか…。そんな中、たかなし法律事務所に安田 (戸塚純貴) がやってくる。付き合っている彼女･ひろみ (冨手麻妙) と結婚する予定なのだが、その前に「婚前契約」を交わすことを要求されたと…。真戸原と翠が、契約書を確認すると、安田に不利な条件ばかりが書かれている。安田はひろみに騙されているのではないかと思う真戸原と翠だが、安田は頑なに否定。そこに凛 (香音) とひろみがやってきて、早く契約をと迫る。ひろみが抱える秘密とは? 安田との契約はどうなる!? そして同棲に向けて瀬奈にアプローチをかける真戸原に、瀬奈はまさかの条件を出してきて…?
While the relationship is progressing smoothly, Matohara (Hokuto Matsumura) consults with Midori (Yuka Itaya) about his love worries. I'm thinking about living with Sena (Haruna Kawaguchi), but if we live together, I think there will be points that bother each other... Meanwhile, Yasuda (Junki Totsuka) comes to Takanashi Law Office. I plan to marry my girlfriend, Hiromi (Mayo Tomite), but before that, I was asked to sign a "premarital contract"... When Matohara and Midori checked the contract, there were only conditions that were unfavorable to Yasuda. Matohara and Midori think that Yasuda may be deceived by Hiromi, but Yasuda stubbornly denies it. Then Rin (Kaone) and Hiromi come and press for a contract as soon as possible. What is Hiromi's secret? What will happen to the contract with Yasuda!? And to Matohara, who approached Sena to live together, Sena came up with unexpected conditions...?
