BLK-255 In order to become a popular gal, the teenage niece Sato Airi practices creampie sex with her uncle without her parents' knowledge.

An innocent anime-loving girl transforms into a gal!! In order to become a popular gal, she secretly trains in creampie sex with her uncle, without her parents' knowledge!! ★After being dumped by her classmate Ichinose-kun, Airi, an otaku girl, decides to become a gal in order to become the type of girl he likes! And...for some reason, with her uncle's advice, she decides to practice "creampie sex"...is creampie sex a given for gals these days...? ? ★A secret diary of an adolescent gal's sexuality, kept secret from mom and dad☆