★ The author is a young mathematics researcher who goes by the pen name “Gröbner Kitei Daisuki bot” (グレブナー基底大好きbot). His short story “Please Put the Plastic Bottle on the Desk. If You Can, You Pass.” won the KAKUYOMU Web Novel Short Story Award and was adapted into a manga. His previous book “My Little Sister Started Getting Interested in Gröbner Bases” ranked No. 1 in the Shosen Grande Mathematics Book Ranking in 2017.
★ This book uses brother-sister dialogue to teach calculus. From “instantaneous slope” through limits, differentiation, integration, definite integrals, indefinite integrals, all the way to ε-δ arguments. The table of contents includes Love and Differentiation, Love and Integration.
★ High school girl Luna Takagi falls in love at first sight with math-loving boy Suisei Sugiura. Bad at math, she asks her older brother Taiyo, a math major, to tutor her in calculus to win Suisei‘s heart. A girl who honestly says “I don’t get it” and an eccentric but caring brother tackle the “fortune-telling” math.
★ For students curious about math and wanting an easy introduction to calculus, and for readers who enjoy light novels and romantic comedies. Each chapter corresponds to a scene: cinema, amusement park, aquarium, autumn leaves viewing, Christmas, graduation.

“…So, what is differentiation? In one word, it‘s the ’instantaneous slope.‘”

Luna Takagi falls in love at first sight with Suisei Sugiura when she meets him by chance on a station platform. To win the heart of Suisei, who loves math, she takes calculus lessons from her older brother Taiyo, a graduate of a national university’s mathematics department. Can Luna, who is bad at math, understand calculus? A high school girl who says “I don‘t get it” when she doesn’t, and an eccentric but caring brother, tackle the “fortune-telling” math.

Gröbner Kitei Daisuki bot（グレブナー基底大好きbot）
Born on September 20, 2015, on Twitter (now X) as “the bot who loves Gröbner bases” (Gröbner basis is a concept in university mathematics). Just his third tweet gave birth to the famous phrase “Gröbner bases go with ponzu,” and since then he has contributed to spreading knowledge of Gröbner bases. His short story on mathematics and job hunting, “Please Put the Plastic Bottle on the Desk. If You Can, You Pass.,” won the KAKUYOMU Web Novel Short Story Award and was adapted into a manga. His math light novel “My Little Sister Started Getting Interested in Gröbner Bases” is available as an e-book and in paperback at some bookstores, and ranked No. 1 in the Shosen Grande Mathematics Book Ranking in 2017. His true identity is a young mathematics researcher.

Prologue: Love and Differentiation
Chapter 1: Slope and Fortune-Telling
Chapter 2: Limits and the Cinema
Chapter 3: Differentiation and the Amusement Park
Chapter 4: Functions and the Aquarium
Chapter 5: Integration and Autumn Leaves
Chapter 6: Definite Integrals and Snow
Chapter 7: Indefinite Integrals and Christmas
Chapter 8: ε-δ Arguments and Graduation
Epilogue: Love and Integration