I love my sister so much! Since I was young, I've always admired my cousin sister, Natsu. When I went home for summer vacation, she was the one waiting for me—she's really kind, beautiful to the point of being dazzling, and she was my first love. Eating watermelon, cooling off on the veranda, wearing a yukata and setting off sparklers… I can't stop my heart from racing at casual gestures or skin glistening with sweat. One day, I was caught with an erection in the bath — 'Is this because of me?' Nattsu onee-chan smiled and took my hand...! After that, in the bedroom, Japanese-style room, veranda… Sneaking out behind my parents' back, we did it so many times, sweaty and inside her! Before I knew it, I couldn't leave her, not in heart or body... At the end of summer, under the sparklers, we swore—'This summer is our lifelong secret.' An unforgettable, forbidden memory of one summer, known only to us.
