僕だけが知ってるんだぜ (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: For some reason, Kaziku Heike transferred from one high school to another. At his new school, he meets a very cool classmate, Ms. Koura. She has an older sister who is a famous model and never smiles. But then he sees Koura's smile and his whole world changes! For this smile, ...... I'll do anything! Taamo of "Taiyou no ie" draws you into a high school life that never stops pounding and grinning!

(Translator: DeepL)