ヤスコとケンジ

Since losing their parents, high schooler Yasuko Oki has lived with her older brother Kenji, a former biker gang leader turned shojo manga artist. Their relationship is anything but harmonious, with Kenji's overprotective antics and Yasuko's frustrations leading to constant bickering. When Kenji forces Yasuko to attend cram school, she meets Jun Tsubaki, a smart and charming boy who catches her eye—but their budding connection is complicated by the tangled past between Kenji and Jun's older sister, Erika, a former gang leader herself. As sibling rivalries and unexpected romances collide, Yasuko and Kenji navigate the chaos of family, love, and growing up. (Unreviewed summary by Grok 2)