Mentioned in Ryszarda’s dialogue and her archangel, it’s Raphael!
Those with blood type O are known to be optimistic and unpredictable and don’t sweat the small stuff.
Sweet flour/powder could be もち粉 (mochiko), a type of glutinous rice flour (or sweet rice flour) made from mochigome which is glutinous short-grain Japanese rice. Known for its sticky and chewy texture, mochiko is used particularly to make Japanese pastry and sweets. (Ref: JustoneCookbook) It probably isn’t sugar as sugar will be 砂糖 (sato). But I could be wrong, am bad at cooking too!
Edit: i made a mistake it wasn’t 30 thousand but rather 30 ten thousand therefore the correct number is 300 thousand. An anon told me it is a reference to the speed of light! 3 x10^8 = 300 thousand! That's amazing thanks anon!
Another Edit:
Someone told me that rice flour doesn’t really make as much sense as sugar. And my original reason for choosing rice flour is because Raphael uses “うまい 粉(sweet flour/powder)” and I was thinking if it was sugar they could have just used “糖” but they didn’t and opted on the packaging to use “ 粉(flour/powder)”. However after googling a bit more on sites that specialize in baking I found out that icing/powdered sugar is “ 粉糖 “ which solves both my problems HAHA as it uses the kanji for flour/powder + sugar so this is most likely the correct ingredient Raphael is using (Ref: alittleshipintokyo). I learn something new and am still learning! Please be patient with my mistakes!