Her husband always goes on a business trip during Obon and the end of the year, and when his wife, Yumiko, feels lonely without her husband and is overwhelmed with sexual desire, she finds a perverted doujinshi in her husband's room while he is on a business trip. Her husband, who she thought didn't have strong sexual desires, finds a book like this... She starts masturbating, imagining intense sex with her husband like in the doujinshi, when suddenly a man next to her shows up...? Unable to resist the young man's violent sex, Yumiko drowns in lust...!