Kuroto has had a lot of special exams over the years, even though he cleared all of them easily- he still couldn't help but feel bad for his friends who weren't as gifted as him.
One day- a surprise special exam was held in the assembly in front of everyone, with a big ground full of grade 1 curses and many obstacles all stuffed into one big ground.
The challenge was to kill every curse and either pass or destroy every obstacle with a time span of 0.05 seconds. This exam was only meant for Kuroto while everybody else had to watch him. The only thing is, something was very off. While announcing the catch, there were only two rules.
"You may not move even by an inch and not even a single scratch should found on the ground." The announcer spoke in a very serious tone. The whole assembly froze in shock, thinking that not even Kuroto would be able to do this test. However- he had already found the solution, but it wasn't going to be easy to pull off.
"The only way to beat this in the given time span was to Master black, as doing so would be the only way that I could get enough speed and force to destroy everything while at the same time restraining the force of attraction in order to not destroy the whole ground." Muttered Kuroto as he realized this in his head.
As he headed onto the stage, the crowd watching in curiosity- he wasn't sure if he could Master Black while not being anywhere close to his prime. Then again, this exam worth most of his grade.. and mastering black was the only way.