Rise! Himari's Big Sweets Experiment!.Yuu Tachibana, a sweets scientist who wrote Himari's favorite book, asks her to be his assistant in a live experiment to bake a giant sponge cake. Despite her initial nerves, Himari manages to provide useful input when preparing the cake batter. Despite the cake cooking properly thanks to Himari's adjustments, it ultimately collapses under its large weight...