My subject turned into a beautiful girl

"An Yi, what happened to make your math grades improve so dramatically?" "I've fallen in love with math." "...Anything else?" An Yi blinked, looking at the translucent, silver-white-haired girl beside him who was eating a bag of baking soda crackers. The girl paused, expressionless, pulled a cracker from the bag, and stuffed it into his mouth. [Math gave you [an ordinary baking soda cracker]][Your [calculation ability] has been greatly improved! Duration: One hour] "I've fallen in love with math!"