Sara, who secretly worries about her thick pubic hair, relieves her growing sexual frustration by having her brother Tsubasa lick her with his tongue. However, Tsubasa is also of marriageable age and asks to insert himself into his sister's pussy, but she manages to convince him that it's not okay because they are brother and sister. However, Tsubasa is determined to have sex, so he secretly gives his sister an aphrodisiac he found online... One day, Sara's body becomes more sensitive than usual, and she ends up craving her brother's dick herself. A story of incestuous love that leads to a major reversal with an aphrodisiac!