Denji and Reze are in the Fourth East High School(aka Asa's school), both learning very slowly

right now, they're on the school's rooftop, eating their lunch together

Reze: Chewing "So Denji, your little sister's teaching you third grade math, right?"

Denji: "I know! And i didnt even went to first grade!" Denji says with a cocky smirk

Reze: genuinely impressed "Really? You're so lucky!"

Denji continues being all arrogant while he eats his lunch