Spare eraser? Check. Extra folding umbrella? Check. First aid kit? Check. Cool and collected high school student Risa Amakawa has something in her heavy bag for every situation, and the last thing she needs—or knows how to ask for—is anyone's help. When she saves a beat-up delinquent in the park one rainy evening, she refuses any sort of repayment. But it turns out that saving the notorious Zen Ohira buys her the attention of some unsavory characters. As Zen keeps swooping in to help her out of one pickle after another, her feelings about relying on anyone but herself—and her feelings toward Zen—slowly begin to change...