100GFS S2 Episode 1 - Seconds Please!

Kurumi's age never really bothered me since she's literally only a year younger than Rentarou lol that's a perfectly normal Age Gap in the US

Hahari opens the flood gates and tells you that girlfriends won't be exclusive to highschool Kurumi then immediately reminds you that numbers go down as well as up.

Kurumi is only one year younger since Rentaro is in the first year of high school (tbh time means nothing because nobody ages).