Because during Valentine’s Day, she will be giving away free cookies… hardtack to be precise.
The source light novel’s creator, Carlo Zen, will also be releasing some Valentine’s Day “Propaganda” on the anime’s official website.
Anyway, on Valentine’s Day itself, February 14, 2017, Gamers Akihabara will be giving hardtack cookies from 8:00 pm – 9:00 pm JST, or until supplies run out.
Looks like Tanya Degurechaff from Saga of Tanya the Evil ain’t so evil after all!