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15-byou Dake - I Know I'm Falling

15-byou Dake - I Know I'm Falling

15秒だけ ~I know I'm falling~

Hirose Kazumi, the school's beauty, is secretly in love with her older sister's boyfriend. When she learns that they are getting married, she impulsively hooks up with Yamamura, a classmate with whom she's been exchanging glances. They become sex buddies under two conditions: their relationship must remain a secret from school, and they must not fall in love with each other.

As time passes, Kazumi's sister gets married, and their arrangement continues. But when Yamamura confesses his feelings for her, the relationship ends—because he is transferring schools. Only then does Kazumi realize that she has fallen for him too, and their love becomes mutual.

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