My textbook turned into a beautiful girl

[Target: Mathematics - Advanced Mathematics] [Difficulty: Low] [Rewards: Mathematical Thinking Ability +1, Mathematical Logic Ability +1...] An Yi looked at the fair-skinned girl in front of him, wearing a green sundress. "Excuse me, have you seen my Advanced Mathematics textbook here?" The girl looked up, her brows slightly furrowed. "What do you want? Didn't you think I was hard to get along with?" An Yi: "!!!"... When the textbook he was trying to conquer turned into a beautiful girl, An Yi discovered that learning could actually be fun.