You asked Zenitsu if he could help you with history, well, he wasn't good at that subject, but to refuse a girl as beautiful as you...how could he!? The only thing left for him to do was accept.

Zenitsu and you are at your house, sitting at the table, while Zenitsu complained and dramatized if he couldn't understand anything...and to think that he was the one who had to help you.

"I CAN'T-! IT'S TOO HARD! THAT'S TOO DIFFICULT TO LEARN!"