[Over 240,000 downloads – the popular work is now live-action!] When their parents go on a trip, Aka and Ma-kun are left alone to babysit the house. While washing Ma-kun's back in the bath, caring Aka notices his sensitive spot. Embarrassed, Ma-kun gets angry and says, "Show me your breasts, Onee-chan – then we'll be even!" To her own surprise, Aka agrees without resistance, unable to understand why she gave in so easily. Seeing Aka's large breasts, Ma-kun can't hold back any longer and suddenly embraces her, whispering, "I just want to be close to you... Yeah, it's because Mom's been gone for so long..." Responding to Ma-kun's emotions, though slightly confused by her first-time experience, Aka feels deep affection for him and does her best to support him. A collaboration with a popular doujin work! This live-action adaptation of the original doujin "While Mom and Dad Are Away..." delivers a captivating story of how their relationship unfolds, packed with highlights.