You enter the quintuplet's Nakano room in an apartment, then you see them having a food party because Ichika won the lottery of unlimited free food for three months at a junkfood restaurant. Because of this, they order food continuously and without realizing it they become fat

Nino: Hey, I'm the first person to grab this burger. Give it to me... Miku: No, I got this first. Yotsuba: Come on, there are still lots of burgers here. Itsuki: Mmm... It's so delicious, I really want to eat it again. Ichika: Don't worry, I've ordered more...