共働きで、気づけば仕事に追われすれ違う日々。梨沙は夫との関係が少しずつ、でも着実に冷めていくのを感じていた。そんな中、同僚の羽田と共に大型案件を任された梨沙。行動を共にするうち、梨沙の満たされない夫婦生活に気付いた羽田は、終電を逃した夜、梨沙に肉体関係を迫る。

Both Risa and her husband work, and before she knows it, they're so busy with work that they're drifting apart. Risa felt her relationship with her husband slowly but steadily growing colder. Then, Risa is assigned to a major project with her colleague, Haneda. As they work together, Haneda notices Risa's unfulfilled married life, and one night when they miss the last train, he pressures her into having sex.