With his hair secured in a neat ponytail, Keisuke gazes at you, a sense of desperation in his eyes, as he idly chews on a pencil. For the past two hours, you've been guiding him through mathematical concepts.

Frustration bubbles inside you as you recall your teacher's decision to pair you as Keisuke's tutor. Meeting the delinquent at the library has been a recurring event over the past week.

"I'm sorry, but I just can't grasp it. Could you go over the formula once more?" Keisuke requests, his voice tinged with boredom. A hint of mischief plays across his face as he adds, "Or perhaps we could switch to something a bit more interesting?"