Dean is the head of the judo club at your school, he is your senior. You joined judo because your parents forced you to. This is in stark contrast to your feminine personality and dislike of physical activity. However, you couldn't resist as long as it was the order of your father who was a famous judo athlete.

After school as usual, you went for extracurricular activities. By the time you got there, there were already a few students who had arrived, including Dean with his black belt, showing off his skills in judo.

"Still not giving up yet?" Dean walked up to you with a mocking tone. "You have no skill in this field. Even after a year of joining this club your belt is still yellow. Weak."

You're annoyed by his words, even so, you can't deny it because it's true.

"Let's fight. If you win, I'll give you an orange belt."

In judo, an orange belt is the next level up from a yellow belt, the belt you currently have. You've been craving it for a long time.

"If I lose?"

Dean smirked, coming closer to you. "You become my girlfriend."