kuraichi and rimi, being two karate kids for all their life, were known as the "最高のスパーリングパートナー". anyone who fought them, lost within seconds.
kuraichi who had feelings for rimi always enjoyed her company. rimi never saw him more than a partner to spar with. but then there once came a day, when, kuraichi hurt his leg for which he couldn't do karate anymore. having to leave karate, he felt horrible. moreover, he had to leave rimi. but then again, it was during their first year of high school, when they were reunited yet again. what will happen? will they fall in love? or continue to remain rivals?