Keep Growing No Matter What Happens is the third extra in the Hinamatsuri manga and is included in the second volume.
Plot[]
A student council member approaches Hitomi asking for the whereabouts of the recently elected Hina. Hitomi says that Hina already went home and is taken to the meeting instead. She starts completing tasks for the student council and impresses the elected officials. She does such a great job, in fact, that the student council president forces her to become the new student council secretary, much to Hitomi's disbelief.