What kind of after-school activity does she get her hands so messed up from, the Knife Game Club?

thescarredman said:

What kind of after-school activity does she get her hands so messed up from, the Knife Game Club?

It's a Japanese Romance Comedy trope. The girl tries to make Valentine's chocolate for the guy she likes, but since she's terrible at cooking and using utensils she ends up cutting her fingers while making it. Each bandage is "proof" that she kept trying her hardest despite her ineptitude.