Knock Knock

Yoshika is almost 18 years old. She is worried about the future because she's not good at studying and she has some problems at home... In the midst of these bewildering days, she sees a "punching bag" act on the street. She is attracted by their sign, "For every punch you land, you win 100 yen." Her life begins to change as a result of this challenge. (Source: Shonen Jump+, translated)