Sana, who works as a librarian in Tokyo, has returned to her hometown. Sana is worried about her brother Keiji, who is only interested in sports and has no interest in women. When Sana flashed him and said 'I was going to let you touch,' his pent-up sexual desires exploded! Using his strength, he grabbed his sister and groped her massive breasts! He forced her to give oral sex and finally graduated from virginity with sex that resulted in internal ejaculation... A single joke awakened his brother's insatiable lust, causing him to chase her around the house all day, begging for raw intercourse anywhere.
