Nene, excited for her long-awaited trip to Hawaii, gets a special bikini and happily tries on different swimwear styles in front of the mirror. As she poses, her cousin Ryota passes by, instantly captivated by her voluptuous big tits nearly spilling out of the bikini top, letting out a deep sigh. Noticing his reaction, Nene impulsively asks him to give her an oil massage. As Ryota's hands glide over her soft skin, his desire grows uncontrollable, slipping his hands beneath her bikini bottom. What begins as a simple favor quickly spirals into an intense, forbidden incest encounter between the two.