The devilish gal sister "Rika" has become a high school girl and is curious about sex! She has started studying dirty talk to seduce you (her beloved brother)! Whenever she finds you anywhere in the house, she will approach you with obscene verbal abuse! She will barge into the bathroom, sneak into the bedroom, or invite you into her room and seduce you in a lewd outfit! "Big brother... you're really perverted for having a baby with your sister ♪" She gets drunk on the sex she just learned while teasing you in gal talk!