Living with her husband 's parents family who took over family business. When he got accustomed to living with his mother-in-law, his brother came back with debt. When I wake up, they just notice my brother 's eyes when they are away from their family. I felt the body burning in spite of a frustrating look of heat. Entangled gaze. In the unpolaring summer heat, sweat of each other reflected dazzlingly and the two opened the forbidden door ... 家業を継いだ夫の実家で生活をするりな。義父母との暮らしに慣れた頃、義兄が借金を抱えて出戻ってきた。家族が留守にした二人きりの夜、目を覚ましたりなは義兄の視線に気づく。熱のこもったすがるような眼差しに、思わずりなは身体が火照るのを感じた。絡み合う視線。うだるような夏の暑さの中、お互いの汗が眩しく映り二人は禁断の扉を開けた…