The story is about a son-in-law, Shinji, who works at the same company as his mother-in-law, Sanae. Sanae is a strong-willed manager and is often worried about Shinji's mistakes and his potential as the future company president. Sanae lives with Shinji and his wife Miyuki, and frequently scolds Shinji at home. One day, Shinji reaches his breaking point and loses his temper with Sanae. After Sanae scolds him more harshly than usual, Shinji snaps and ends up assaulting Sanae. Afterward, Shinji leaves the company in a hurry.