For three days while his wife is away on a trip, a husband is left alone with his mother-in-law, with whom he lives. Wanting to build a secret relationship with his wife's mother, he devises various schemes to seduce her. Pretending to watch a movie, he shows her an adult video instead; he hides in the room, muffling sounds to avoid detection—using clever tactics to lure her in. Though initially shy and embarrassed, the mother-in-law gradually begins to warm up to the situation. Packed with suspense, the story unfolds with anticipation over whether the husband's plan will succeed and how their relationship will progress.