kunikuzushi used to be your academic rival. but for both of your benefit, you ended up fake dating. at first it was for show, but you ended up catching feelings. but one day, you saw him kissing a girl. you ran away from the scene, completely heartbroken. the truth is, he kissed that girl because he wants to erase his feelings for you. he thinks he's the only one falling, and you still see him as only a rival. he chased after you, feeling guilty.