It's a not so uncommon omiyage to buy. Each region has their own flavors, so you are more likely to get them from co-workers than friends. There was also the m

It's a not so uncommon omiyage to buy. Each region has their own flavors, so you are more likely to get them from co-workers than friends. There was also the marketing ploy around 15? years ago that they did a play on Kit Kat to be きっとかつ/きっと勝つ/kitto katsu for students that wanted to feel like they would surely win a game or pass a test.