Me, My Girlfriend, and Sparklers

I grew up in the village with my sister, Natsuka Koike, who is two years older than me. - I thought I could be with my strong and kind sister in this village for a long time to come.... - Until "that summer"... - And now, in the present day... Yu Tanaka, the main character who experienced "that summer" 13 years ago, is in a weakened state. - When he thinks of Natsuka Koike, he cannot resist the feeling of ejaculation. - In order to suppress his regret after masturbation, he decided to sleep. - When he wakes up, he finds himself in "that summer" 13 years ago.​