Mako is to marry the son of her boss at work, who introduced her to him. However, she is actually in love with her boss, Tetsuzo. Mako is a serious person who cannot say no, so she marries Tetsuzo without telling him how she feels, and they end up in a relationship as "father-in-law" and "daughter-in-law". Mako cannot forget her feelings for Tetsuzo, so her relationship with her husband is not going well, and they have not had sex even once since they got married. Then, she decides to live with her husband's family, and Mako finds out the family's twisted secret...