Kaichou, Sukitte Itte mo Ii desu ka? - Vol. 1 Ch. 2

[MangaDex]

 

[Purplelibraryguy]

So do the Japanese not have baking powder? 'Cause, like, most of my cake recipes use all-purpose, certainly non-self-raising, flour. Isn't self-raising flour just flour with a bit of baking powder pre-added? Why is this such a problem?