Hikari, the granddaughter, is a modern high school girl who is indifferent to sex. Her grandfather takes advantage of her and makes lewd requests while caring for her. "Can I lick here again today?" "Please clean my dick too." Hikari dutifully complies with such unreasonable requests. Finally, the grandfather attempts to insert his penis into Hikari's granddaughter's vagina, which is forbidden... This time, the story unfolds in a completely immersive one-on-one setting! The ultimate J-girl...