Это что за шутка?

Aiko tries to tell Shinichirō her feelings but is interrupted when Miyokichi arrives. Miyokichi later goes shopping with Aiko and the latter stomps out of a shop flustered and tells Miyokichi that she bought the sweater that Shinichirō had picked up before. Miyokichi gets the hint and feels troubled. While frustrated about Jun approaching Hiromi during school, Shinichirō asks Noe to stop bothering him for while and ends up getting his belt being pulled out by Noe. Jun goes out with Hiromi on a date Sunday, and after they arrive back at her home, Jun tells her that Shinichirō and Noe are going out together. Later that night, Shinichirō overhears Hiromi and his mother's quarrel and has a tussle with his mother and Hiromi. Subsequently, Shinichirō finds out from Hiromi that he and Hiromi might share the same father.