Alice has been living alone with her son Ryun since her husband passed away in an accident. She raised him well, so he managed to get a job at a top company and marry happily... or so she thought. His wife, Alice, hasn't done any housework since their marriage and spends every day just playing around. One day when Alice comes home drunk with a man friend, having a party without even asking permission, poor Ryun's mother can't take it anymore! She scolds Alice but instead of apologizing, Alice holds a grudge against her mom and comes up with a plan involving her new boyfriend...

夫を事故で亡くして以来、息子の潤と二人きりで生きてきた有花。懸命に育てた甲斐もあり、潤は一流企業に就職、結婚もして幸せな暮らしを送っている…はずだった。嫁・アリスは結婚して以来、家事もろくにせず遊び歩く毎日。そんなある日、有花が家に帰るとあろうコトか男友達を家に上げて飲み会をしていて！？堪忍袋の緒が切れた有花はアリスを叱責するが、アリスは有花に逆恨みをし、男友達と共謀してある計画を思いついて…。