Chiyo (Nana Sakuraba), who started dating Seo (Terunosuke Takezai), asked her junior at work, Tomo (Risa Watanabe), to go to a lingerie store with her in order to become more feminine. On the other hand, although she has confirmed her relationship with Chiyo, Seo is still sighing for making an irreversible mistake. Seo regrets having sex with Chiyo even though he knew she had psychological trauma. In order to date his girlfriend in a more relaxed and pleasant way, he, Yumelu (Ryohei Odai) and Jun (Shingo Fujimori) make a plan together...