A husband is forced to live alone after his beloved wife is hospitalized, but then his wife's mother comes to Tokyo from her hometown in Kochi to help! A life of just the mother-in-law and son-in-law begins. When the mother-in-law, wearing low-cut clothing, treats him with kindness, the son-in-law drowns in a lewd and intimate life with his busty, 50-something mother-in-law! While the wife is away, the relationship between the two rapidly intensifies!