What's The Secret To Achieving Happiness Through A Single Beef Bowl? Poverty! is the seventh extra in the Hinamatsuri manga and is found in the fourth volume.
Plot[]
Anzu debates spending 250 yen on a beef bowl during a promotion. Hina runs into her on the street and talks her into dining there. Over the course of the meal, the other patrons realize Anzu's limited means and nearly destitute living conditions, so they buy her another beef bowl, much to her confusion.