18 years old. Serina, an honor student at the academy who boasts a score of 70, has a secret that she can't tell anyone. It's about doing naughty things with a middle-aged uncle between school and cram school. Serena-chan relieves her stress from studying by sweating and SEX with her uncle. It's too erotic. It's a desperate patch where you'll be pounded over and over again and the English words you've learned will fly away. Is this girl happy to shoot cum into her vagina even though she lost everything when she got pregnant? Or is she a sex genius...