Hina arrives in Tokyo and tells her older brother she wants to become more mature. On this day spent together in a Shinjuku hotel, her brother says becoming an adult means experiencing erotic things. With consent, the siblings begin by kissing. As her brother fondles her breasts, Hina blushes deeply, her face turning bright red. When she shyly asks, "Do you do this with other girls too?" her brother looks flustered. After pulling down her panties and stimulating her clit, Hina makes a mixed expression of embarrassment and strange sensation. Then, her pussy is licked briefly before her brother inserts his index finger up to the second knuckle. Next, she sees her brother's erect penis for the first time. Though hesitant, she opens her mouth and takes it in, moving her head up and down to give a blowjob. Careful not to let her teeth touch, she sucks diligently until her brother cums inside her mouth. The semen tastes very bitter—her first time experiencing it. Next comes toy play. A vibrator first teases her nipples, then glides over her slit through her panties before being inserted inside her. Initially in pain and resisting, she gradually begins to accept it. After reviving his erection with another blowjob, penetration begins. Starting in missionary position, they switch to cowgirl, where Hina pleads, "It hurts, let's stop," but her brother ignores her and moves into doggystyle. Soon, his thrusts grow intense, finishing with a facial. He pumps every last drop of cum onto her face. ※Image is for illustration only.