大学仲間との旅行中、木ノ下和也(大西流星)は元カノの七海麻美(秋田汐梨)から突然キスをされる。「我慢できなくなっちゃった」と和也の胸に顔を埋めてくる麻美。あまりの衝撃に身動き一つできない和也の脳裏には、かつて“運命の人”と決めた麻美への思いが鮮烈によみがえってくる…。
動揺を隠し水原千鶴(桜田ひより)たちの輪に戻る和也。すると、今度は罰ゲームで千鶴とキスさせられそうな状況に!麻美が見ている前でそんなことはできない。だが、レンタル彼女として高いプロ意識を持つ千鶴は、和也に向かって静かに瞳を閉じる。少しずつ近づいてくる千鶴の唇。必死でその場を収める方法を考える和也。そして意を決した和也は、ついにあの言葉を口にする。ところが、それを聞いた木部芳秋(金子隼也)は、いきなり和也に殴りかかり…!?
While on a trip with college friends, Kinoshita Kazuya (Onishi Ryusei) is suddenly kissed by his ex-girlfriend Nanami Asami (Akita Shiori). Asami buries her face in Kazuya's chest, saying, "I can't stand it anymore." In Kazuya's mind, unable to move due to the shock, the thoughts of Asami, who he once decided to be his "fated person," vividly revive. Kazuya hides his turmoil and returns to Chizuru Mizuhara (Hiyori Sakurada) group. Then, in a punishment game, I feel like I'm going to be forced to kiss Chizuru! I can't do that in front of Asami. However, Chizuru, who has a high level of professionalism as her rental girlfriend, quietly closes her eyes towards Kazuya. Chizuru's lips approached little by little. Kazuya desperately thinks of a way to settle the situation. And Kazuya, who has made up his mind, finally speaks those words. However, when Yoshiaki Kibe (Shunya Kaneko) hears this, he suddenly attacks Kazuya...! ?