Miki is married to a man with a child. She dreamed of a happy married life, but her life changed when her husband's stepchildren moved in with her. She gets along well with her younger brother Takashi, but her older brother Hiroki always gets in the way. Hiroki gets irritated by Miki, who treats her empathetically. Still, she believed in her family's connection, saying, "Someday you'll understand," and from that day on, she began to spend her days as Hiroki's obedient sex slave.
