天城恭一（速水もこみち）の誕生日会が大々的に催される。招待を受けた佐藤唯（松井愛莉）は頑なに出席を断るが、社長秘書の名取蒼（入江甚儀）から、パーティーで天城のメンツに泥を塗れば、天城との縁を切れると言われ、しぶしぶ出席を承諾する。会場に到着した唯は、招待客の多さと各界の要人が居並ぶ雰囲気に圧倒される。その中には天城の父で会長（渡辺裕之）の姿も。天城は父に、唯を「僕の大切な女性です」と堂々と、かつ一方的に紹介。周囲が一瞬静まり返ったところで唯はすかさず、恭一の事を「心の底から気持ち悪い！」と言ってのける。再び訪れた静寂に、唯は「立派にやらかした」と確信。さらに、天城の首を締め上げたり、顔に水をぶちまけたり、十分に天城のメンツを潰して会場を後にする唯。だが、その胸中にはひとつ心残りがあった。それは…。
A big birthday party for Kyoichi Amagi (Mokomichi Hayami) will be held. Yui Sato (Airi Matsui) who received the invitation stubbornly refuses to attend, but the president's secretary Ao Natori (Jingi Irie) says that if you smear Amagi's men at a party, you will be cut off from Amagi. We reluctantly accept the attendance. Upon arriving at the venue, Yui is overwhelmed by the large number of invited guests and the atmosphere of dignitaries from various fields. Among them is Amagi's father and chairman (Hiroyuki Watanabe). Amagi proudly and unilaterally introduced Yui to his father as "my dear woman." When the surroundings calmed down for a moment, Yui quickly dismissed Kyoichi as "I feel uncomfortable from the bottom of my heart!" Yui was convinced that he had done a good job in the silence he visited again. In addition, Yui leaves the venue by tightening Amagi's neck, splashing water on her face, and crushing Amagi's men enough. However, there was one regret in his heart. that is….
