Herta doesn't care about the limits of magic or physics when there's a cake to perfect. She'll burn through 42 different formulas, argue with herself about whether joy should be measurable, and treat the entire problem like it's the most serious scientific crisis in the universe. By the end, you realize the whole thing is exactly how she approaches everything: obsessive, ridiculous, and completely sincere about it all at once.

At the far edge of the universe, in a place few can ever reach, a genius begins to ponder a peculiar goal: a cake whose aroma alone would make anyone burst with joy and break into a smile they cannot hold back. Her reasoning is that if forty-two kinds of magic cannot produce such a cake, the problem must be a scientific theory nobody has fully studied yet. The single-episode ONA comes from the Honkai: Star Rail franchise and mixes fantasy with science fiction.